algebra.com Website Information
Daily Unique Visits: 40,146
Daily Page Views: 240,876
Income Per Day: $482
Estimated Value: $347,040
This website is located in United States and is using following IP address 104.196.52.56. See the complete list of popular websites hosted in United States.
algebra.com is registered under .COM top-level domain. Please check other sites in .COM zone.
Website algebra.com is using the following name servers:
- ns21.chudov.com
- ns19.chudov.com
and is probably hosted by GOOGLE - Google LLC, US. See the full list of other websites hosted by GOOGLE - Google LLC, US.
The highest website algebra.com position in Alexa rank database was 5471 and the lowest rank position was 320108. Current position of algebra.com in Alexa rank database is 35725.
Desktop speed score of algebra.com (78/100) is better than the results of 68.93% of other sites and shows that the page desktop performance can be improved.
Mobile usability score of algebra.com (77/100) is better than the results of 38.59% of other sites and means that the page is not mobile-friendly.
Mobile speed score of algebra.com (59/100) is better than the results of 52.08% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
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algebra.com Alexa Rank
The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.
algebra.com whois
WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.
Domain Name: ALGEBRA.COM
Registry Domain ID: 50230_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.domain.com
Registrar URL: http://www.domain.com
Updated Date: 2015-12-02T14:04:10Z
Creation Date: 1995-11-09T05:00:00Z
Registry Expiry Date: 2020-11-08T05:00:00Z
Registrar: Domain.com, LLC
Registrar IANA ID: 886
Registrar Abuse Contact Email: compliance@domain-inc.net
Registrar Abuse Contact Phone: 602-226-2389
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: NS19.CHUDOV.COM
Name Server: NS21.CHUDOV.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2018-03-24T19:26:34Z
algebra.com server information
Servers Location
algebra.com desktop page speed rank
Last tested: 2016-07-12
Desktop Speed
Medium
78/100
algebra.com Desktop Speed Test Quick Summary
priority - 9 Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://algebra.com/
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priority - 8 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 4 blocking script resources. This causes a delay in rendering your page.
Use asynchronous versions of the following scripts:
https://pagead2.googlesyndication.com/pagead/show_ads.js
https://pagead2.googlesyndication.com/pagead/show_ads.js
https://pagead2.googlesyndication.com/pagead/show_ads.js
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priority - 7 Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://www.algebra.com/banners/Frank-728x90.gif (expiration not specified)
https://www.algebra.com/images/google_custom_search_smnar.gif (expiration not specified)
https://www.algebra.com/images/tabs/subnav-bg.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-left-on-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-middle-off-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-middle-off-onleft-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-right-off.gif (expiration not specified)
https://www.algebra.com/images/teacher.jpg (expiration not specified)
https://apis.google.com/js/plusone.js (30 minutes)
https://apis.google.com/js/rpc:shindig_random.js?onload=init (30 minutes)
https://pagead2.googlesyndication.com/pagead/osd.js (60 minutes)
https://pagead2.googlesyndication.com/pagead/show_ads.js (60 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)
https://www.algebra.com/cgi-bin/plot-formula.mpl?e…2%28z%29%0D%0A&x=0003& (24 hours)
https://www.algebra.com/images/google_custom_search_smnar.gif (expiration not specified)
https://www.algebra.com/images/tabs/subnav-bg.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-left-on-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-middle-off-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-middle-off-onleft-long.gif (expiration not specified)
https://www.algebra.com/images/tabs/tabs-right-off.gif (expiration not specified)
https://www.algebra.com/images/teacher.jpg (expiration not specified)
https://apis.google.com/js/plusone.js (30 minutes)
https://apis.google.com/js/rpc:shindig_random.js?onload=init (30 minutes)
https://pagead2.googlesyndication.com/pagead/osd.js (60 minutes)
https://pagead2.googlesyndication.com/pagead/show_ads.js (60 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)
https://www.algebra.com/cgi-bin/plot-formula.mpl?e…2%28z%29%0D%0A&x=0003& (24 hours)
priority - 2 Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 53% of the final above-the-fold content could be rendered with the full HTML response.
priority - 0 Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 3.9KiB (61% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/tabs-middle-off-onleft-long.gif could save 1.1KiB (60% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/tabs-middle-off-long.gif could save 1.1KiB (57% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/tabs-left-on-long.gif could save 1KiB (63% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/subnav-bg.gif could save 734B (66% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/tabs-middle-off-long.gif could save 1.1KiB (57% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/tabs-left-on-long.gif could save 1KiB (63% reduction).
Losslessly compressing https://www.algebra.com/images/tabs/subnav-bg.gif could save 734B (66% reduction).
priority - 0 Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Minify HTML for the following resources to reduce their size by 818B (11% reduction).
Minifying https://www.algebra.com/ could save 818B (11% reduction) after compression.
algebra.com Desktop Resource Breakdown
| Total Resources | 36 |
| Number of Hosts | 11 |
| Static Resources | 24 |
| JavaScript Resources | 15 |
algebra.com mobile page speed rank
Last tested: 2016-07-12
Mobile Speed
Bad
59/100
algebra.com Mobile Speed Test Quick Summary
priority - 34 Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://algebra.com/
https://algebra.com/
https://www.algebra.com/
https://algebra.com/
https://www.algebra.com/
priority - 32 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking script resources. This causes a delay in rendering your page.
Use asynchronous versions of the following scripts:
https://pagead2.googlesyndication.com/pagead/show_ads.js
https://pagead2.googlesyndication.com/pagead/show_ads.js
https://pagead2.googlesyndication.com/pagead/show_ads.js
priority - 7 Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://www.algebra.com/banners/Frank-728x90.gif (expiration not specified)
https://www.algebra.com/images/google_custom_search_smnar.gif (expiration not specified)
https://www.algebra.com/images/teacher.jpg (expiration not specified)
https://apis.google.com/js/plusone.js (30 minutes)
https://apis.google.com/js/rpc:shindig_random.js?onload=init (30 minutes)
https://pagead2.googlesyndication.com/pagead/osd.js (60 minutes)
https://pagead2.googlesyndication.com/pagead/show_ads.js (60 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)
https://www.algebra.com/cgi-bin/plot-formula.mpl?e…2%28z%29%0D%0A&x=0003& (24 hours)
https://www.algebra.com/images/google_custom_search_smnar.gif (expiration not specified)
https://www.algebra.com/images/teacher.jpg (expiration not specified)
https://apis.google.com/js/plusone.js (30 minutes)
https://apis.google.com/js/rpc:shindig_random.js?onload=init (30 minutes)
https://pagead2.googlesyndication.com/pagead/osd.js (60 minutes)
https://pagead2.googlesyndication.com/pagead/show_ads.js (60 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)
https://www.algebra.com/cgi-bin/plot-formula.mpl?e…2%28z%29%0D%0A&x=0003& (24 hours)
priority - 0 Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Minify HTML for the following resources to reduce their size by 818B (11% reduction).
Minifying https://www.algebra.com/ could save 818B (11% reduction) after compression.
algebra.com Mobile Resource Breakdown
| Total Resources | 44 |
| Number of Hosts | 14 |
| Static Resources | 27 |
| JavaScript Resources | 18 |
algebra.com mobile page usability
Last tested: 2016-07-12
Mobile Usability
Medium
77/100
algebra.com Mobile Usability Test Quick Summary
priority - 16 Size content to viewport
The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.
The page content is 736 CSS pixels wide, but the viewport is only 411 CSS pixels wide. The following elements fall outside the viewport:
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<iframe id="aswift_0" name="aswift_0"> falls outside the viewport.The element
<div>Math Simplifie…lgebra Solver:</div> falls outside the viewport.The element
<a href="/algebra/homew…ive-properties">Distributive,…operties, FOIL</a> falls outside the viewport.The element
<li>Equations</li> falls outside the viewport.The element
<a href="/algebra/homework/Inequalities">Inequalities, trichotomy</a> falls outside the viewport.The element
<a href="/algebra/homew…near-equations">Linear Equatio…Graphs, Slope</a> falls outside the viewport.The element
<li>Proportions</li> falls outside the viewport.The element
<a href="/algebra/homework/percentage">Percentage and Pie Charts</a> falls outside the viewport.The element
<li>Number Line</li> falls outside the viewport.The element
<li>Average</li> falls outside the viewport.The element
<hr> falls outside the viewport.The element
<a href="/algebra/homew…ic-other-roots">Square root, c…oot, N-th root</a> falls outside the viewport.The element
<a href="/algebra/homew…and-fractional">Negative and F…onal exponents</a> falls outside the viewport.The element
<a href="/algebra/homew…with-variables">Expressions in…, substitution</a> falls outside the viewport.The element
<a href="/algebra/homew…al-expressions">Polynomials, r…and equations</a> falls outside the viewport.The element
<a href="/algebra/homework/Radicals">Radicals -- co…nvolving roots</a> falls outside the viewport.The element
<li>Quadratic Equation</li> falls outside the viewport.The element
<a href="/algebra/homework/Inequalities">Inequalities, trichotomy</a> falls outside the viewport.The element
<a href="/algebra/homew…s-of-equations">Systems of equ…are not linear</a> falls outside the viewport.The element
<hr> falls outside the viewport.The element
<a href="/algebra/homew…conic-sections">Conic sections…ola, hyperbola</a> falls outside the viewport.The element
<a href="/algebra/homew…ces-and-series">Sequences of n…ow to sum them</a> falls outside the viewport.The element
<a href="/algebra/homew…and-statistics">Probability and statistics</a> falls outside the viewport.The element
<li>Trigonometry</li> falls outside the viewport.The element
<li>Combinatorics and Permutations</li> falls outside the viewport.The element
<li>Unit Conversion</li> falls outside the viewport.The element
<hr> falls outside the viewport.The element
<a href="/algebra/homew…h-and-distance">Length, distan…metric length</a> falls outside the viewport.The element
<li>Proofs in Geometry</li> falls outside the viewport.The element
<a href="/algebra/homew…odies-in-space">Bodies in spac…linder, sphere</a> falls outside the viewport.The element
<li>Parallelograms</li> falls outside the viewport.The element
<a href="/algebra/homew…lines-and-rays">Points, lines,…les, perimeter</a> falls outside the viewport.The element
<li>Polygons</li> falls outside the viewport.The element
<a href="/algebra/homework/Surface-area">Area and Surface Area</a> falls outside the viewport.The element
<hr> falls outside the viewport.The element
<iframe id="aswift_2" name="aswift_2"> falls outside the viewport.The element
<a href="/tutors/lesson…r=nutshellmath">Nutshell Math</a> falls outside the viewport.The element
<a href="/tutors/lesson…tutor=bperkhou">Our Own In-House videos</a> falls outside the viewport.The element
<a href="/algebra/homew…/word/finance/">Finance</a> falls outside the viewport.The element
<a href="/algebra/homework/word/age/">Age</a> falls outside the viewport.The element
<a href="/algebra/homework/word/">Practice solvi…word problems</a> falls outside the viewport.The element
<td>Bored?…cabulary game.</td> falls outside the viewport.The element
<b>Lessons</b> falls outside the viewport.The element
<a href="/rss/">(?)</a> falls outside the viewport.The element
<a href="http://wiki.algebra.com/">You can write…" in solutions</a> falls outside the viewport.The element
<pre>sin^2(z)</pre> falls outside the viewport.The element
<a href="http://www.alg…om/misc/about/">I quit my job…com FULL TIME.</a> falls outside the viewport.The element
<i>I quit my day…hers for free.</i> falls outside the viewport.The element
<a href="http://www.alg…t-password.mpl">Password reset…professors...</a> falls outside the viewport.The element
<i>I added a func…email address.</i> falls outside the viewport.The element
<a href="http://www.alg…cimal-numbers/">Please help me…my web pages!</a> falls outside the viewport.The element
<a href="mailto:ichudov@algebra.com">Igor The WebMaster</a> falls outside the viewport.The element
<li>About Algebra.…te their sites</li> falls outside the viewport.The element
<code><A HREF=http:/…gebra Help</A></code> falls outside the viewport.The element
<li>STUMP Robomoderator program</li> falls outside the viewport.The element
<li>Mobile Algebra…iPhone algebra</li> falls outside the viewport.priority - 12 Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target
<a href="/services/rend…simplifier.mpl">Math Simplifier,Algebra Solver</a> is close to 1 other tap targets.The tap target
<a href="pre-algebra.mpl">Pre-Algebra</a> is close to 1 other tap targets.The tap target
<a href="/algebra/homew…mericFractions">Numeric Fractions</a> and 80 others are close to other tap targets.The tap target
<a href="/algebra/homew…/word/numbers/">Numbers</a> and 9 others are close to other tap targets.The tap target
<a href="/rss/">get notified a…pdates via RSS</a> and 3 others are close to other tap targets.algebra.com Mobile Resource Breakdown
| Total Resources | 44 |
| Number of Hosts | 14 |
| Static Resources | 27 |
| JavaScript Resources | 18 |
algebra.com HTML validation
Errors
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Line: 3 Column: 1 - 60
"...<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html..."
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Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).
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Bad value “text/html; charset=iso-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.
Line: 145 Column: 1 - 74
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The “bgcolor” attribute on the “body” element is obsolete. Use CSS instead.
Line: 147 Column: 1 - 24
"...> </head> <body bgcolor="#F2F2F2"> <scr..."
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The “center” element is obsolete. Use CSS instead.
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Element “center” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
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"...invisible><CENTER></CENT..."
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Element “table” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Line: 187 Column: 1 - 44
"...nvisible> <TABLE cellspacing=0 cellpadding=0 border=0> <TR><..."
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The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
Line: 187 Column: 1 - 44
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The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
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The “border” attribute on the “table” element is obsolete. Use CSS instead.
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"... <TR><TD> <TABLE STYLE="height:$height" CELLPADDING=0 CELLSPACING=0 igor_id=id5 border=0 bgcolor=#AADDFF><TR> ..." Line: 228 Column: 1 - 30
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"...nvisible> <TABLE cellspacing=0 cellpadding=0 border=0> <TR><..." Line: 189 Column: 1 - 95
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The “bgcolor” attribute on the “table” element is obsolete. Use CSS instead.
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"... <TR><TD> <TABLE STYLE="height:$height" CELLPADDING=0 CELLSPACING=0 igor_id=id5 border=0 bgcolor=#AADDFF><TR> ..." Line: 244 Column: 3 - 61
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The “height” attribute on the “td” element is obsolete. Use CSS instead.
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"...></A></TD><TD align=center height=28> ..."
"...ADDFF><TR> <TD ID=t1 CLASS=lefton HEIGHT=35 ><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 192 Column: 214 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 193 Column: 202 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 206 Column: 12 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 207 Column: 253 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 220 Column: 12 - 39
".../div></TD> <TD ID=t2 CLASS=rightoff height=35> ..." Line: 227 Column: 5 - 68
"...R> <tr> <td class=secondary height=35 background=/images/tabs/subnav-bg.gif> <TABL..." Line: 228 Column: 35 - 61
"...ing=0><TR><TD align=center height=28><A HRE..." Line: 228 Column: 129 - 155
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 174 - 200
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 266 - 292
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 311 - 337
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 399 - 425
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 444 - 470
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 533 - 559
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 578 - 604
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 664 - 690
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 709 - 735
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 805 - 831
"...></A></TD><TD align=center height=28> ..."
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Line: 190 Column: 39 - 83
"...EIGHT=35 ><div align=center style="margin-left: 23px;"><B><A ..." Line: 191 Column: 47 - 91
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 192 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 193 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"> <!--..." Line: 206 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 207 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"> <!-- ..."
"...EIGHT=35 ><div align=center style="margin-left: 23px;"><B><A ..." Line: 191 Column: 47 - 91
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 192 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 193 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"> <!--..." Line: 206 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"><A HRE..." Line: 207 Column: 41 - 85
"...height=35><div align=center style="margin-left: 23px;"> <!-- ..."
Duplicate ID “t2”.
Line: 192 Column: 214 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 193 Column: 202 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 206 Column: 12 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 207 Column: 253 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 220 Column: 12 - 39
".../div></TD> <TD ID=t2 CLASS=rightoff height=35> ..."
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 193 Column: 202 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 206 Column: 12 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 207 Column: 253 - 40
".../div></TD> <TD ID=t2 CLASS=middleoff height=35><div a..." Line: 220 Column: 12 - 39
".../div></TD> <TD ID=t2 CLASS=rightoff height=35> ..."
“=” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Line: 206 Column: - 123
"...destination_url=/ rel=nofollo..." Line: 379 Column: - 44
"...tutor.mpl?tutor=nutshellmath> ..." Line: 383 Column: - 64
"...tutor.mpl?tutor=nutshellmath>V..." Line: 388 Column: - 51
"...tutor.mpl?tutor=nutshellmath>N..." Line: 389 Column: - 51
"...tutor.mpl?tutor=bperkhou>Our O..." Line: 492 Column: - 52
"...wers.mpl?userid=all>653000</A>..."
"...destination_url=/ rel=nofollo..." Line: 379 Column: - 44
"...tutor.mpl?tutor=nutshellmath> ..." Line: 383 Column: - 64
"...tutor.mpl?tutor=nutshellmath>V..." Line: 388 Column: - 51
"...tutor.mpl?tutor=nutshellmath>N..." Line: 389 Column: - 51
"...tutor.mpl?tutor=bperkhou>Our O..." Line: 492 Column: - 52
"...wers.mpl?userid=all>653000</A>..."
The “align” attribute on the “td” element is obsolete. Use CSS instead.
Line: 228 Column: 35 - 61
"...ing=0><TR><TD align=center height=28><A HRE..." Line: 228 Column: 129 - 155
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 174 - 200
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 266 - 292
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 311 - 337
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 399 - 425
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 444 - 470
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 533 - 559
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 578 - 604
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 664 - 690
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 709 - 735
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 805 - 831
"...></A></TD><TD align=center height=28> ..." Line: 243 Column: 7 - 21
"...5%> <TR> <TD ALIGN=CENTER> <TA..." Line: 268 Column: 9 - 28
"... </TD> <TD ALIGN=LEFT colspan=1> <BR> ..." Line: 378 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> <A H..." Line: 386 Column: 9 - 19
"...> </TD> <TD ALIGN=LEFT > We h..." Line: 398 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> ..." Line: 403 Column: 8 - 18
"...T> </TD> <TD ALIGN=LEFT > <FO..." Line: 423 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 429 Column: 9 - 19
"...> </TD> <TD ALIGN=LEFT > ..." Line: 441 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 449 Column: 9 - 42
"...> </TD> <TD ALIGN=LEFT class=mobile_invisible> ..." Line: 465 Column: 7 - 48
"...> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> <B>..." Line: 470 Column: 3 - 18
"...ONT> <TD ALIGN=LEFT > <FO..." Line: 484 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 490 Column: 9 - 42
"...> </TD> <TD ALIGN=LEFT class=mobile_invisible> ..."
"...ing=0><TR><TD align=center height=28><A HRE..." Line: 228 Column: 129 - 155
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 174 - 200
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 266 - 292
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 311 - 337
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 399 - 425
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 444 - 470
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 533 - 559
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 578 - 604
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 664 - 690
"...></A></TD><TD align=center height=28> ..." Line: 228 Column: 709 - 735
"...nbsp;</TD><TD align=center height=28><A HRE..." Line: 228 Column: 805 - 831
"...></A></TD><TD align=center height=28> ..." Line: 243 Column: 7 - 21
"...5%> <TR> <TD ALIGN=CENTER> <TA..." Line: 268 Column: 9 - 28
"... </TD> <TD ALIGN=LEFT colspan=1> <BR> ..." Line: 378 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> <A H..." Line: 386 Column: 9 - 19
"...> </TD> <TD ALIGN=LEFT > We h..." Line: 398 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> ..." Line: 403 Column: 8 - 18
"...T> </TD> <TD ALIGN=LEFT > <FO..." Line: 423 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 429 Column: 9 - 19
"...> </TD> <TD ALIGN=LEFT > ..." Line: 441 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 449 Column: 9 - 42
"...> </TD> <TD ALIGN=LEFT class=mobile_invisible> ..." Line: 465 Column: 7 - 48
"...> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> <B>..." Line: 470 Column: 3 - 18
"...ONT> <TD ALIGN=LEFT > <FO..." Line: 484 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 490 Column: 9 - 42
"...> </TD> <TD ALIGN=LEFT class=mobile_invisible> ..."
The “font” element is obsolete. Use CSS instead.
Line: 228 Column: 87 - 100
"...tions.mpl><FONT SIZE=-1>All Se..." Line: 228 Column: 225 - 238
"...gebra.mpl><FONT SIZE=-1>Pre-Al..." Line: 228 Column: 360 - 373
"...bra-1.mpl><FONT SIZE=-1>Algebr..." Line: 228 Column: 493 - 506
"...bra-2.mpl><FONT SIZE=-1>Algebr..." Line: 228 Column: 626 - 639
"...metry.mpl><FONT SIZE=-1>Geomet..." Line: 228 Column: 762 - 775
"...blems.mpl><FONT SIZE=-1>Word P..." Line: 271 Column: 6 - 19
"...BR> <FONT SIZE=-1> ..." Line: 400 Column: 6 - 19
"...<BR> <FONT SIZE=-1> Solve..." Line: 404 Column: 3 - 16
"...=LEFT > <FONT SIZE=-1> <A ..." Line: 444 Column: 9 - 22
"...> <FONT SIZE=-1>Algebr..." Line: 450 Column: 6 - 19
"...ble> <FONT SIZE=-1> <a ..." Line: 468 Column: 3 - 16
"... <BR> <FONT SIZE=-1>We hel..." Line: 471 Column: 3 - 16
"...=LEFT > <FONT SIZE=-1> <A ..." Line: 487 Column: 6 - 19
"...<BR> <FONT SIZE=-1>Become..." Line: 523 Column: 4 - 19
"...0px;"> <B><FONT COLOR=RED>News:<..." Line: 525 Column: 14 - 27
"... <FONT SIZE=-1><I>You..." Line: 529 Column: 14 - 27
"... <FONT SIZE=-1><I>I q..." Line: 535 Column: 14 - 27
"... <FONT SIZE=-1><I>I a..." Line: 541 Column: 14 - 27
"... <FONT SIZE=-1><I>it ..." Line: 560 Column: 22 - 35
"...nk to us: <FONT SIZE=-1><CODE>..."
"...tions.mpl><FONT SIZE=-1>All Se..." Line: 228 Column: 225 - 238
"...gebra.mpl><FONT SIZE=-1>Pre-Al..." Line: 228 Column: 360 - 373
"...bra-1.mpl><FONT SIZE=-1>Algebr..." Line: 228 Column: 493 - 506
"...bra-2.mpl><FONT SIZE=-1>Algebr..." Line: 228 Column: 626 - 639
"...metry.mpl><FONT SIZE=-1>Geomet..." Line: 228 Column: 762 - 775
"...blems.mpl><FONT SIZE=-1>Word P..." Line: 271 Column: 6 - 19
"...BR> <FONT SIZE=-1> ..." Line: 400 Column: 6 - 19
"...<BR> <FONT SIZE=-1> Solve..." Line: 404 Column: 3 - 16
"...=LEFT > <FONT SIZE=-1> <A ..." Line: 444 Column: 9 - 22
"...> <FONT SIZE=-1>Algebr..." Line: 450 Column: 6 - 19
"...ble> <FONT SIZE=-1> <a ..." Line: 468 Column: 3 - 16
"... <BR> <FONT SIZE=-1>We hel..." Line: 471 Column: 3 - 16
"...=LEFT > <FONT SIZE=-1> <A ..." Line: 487 Column: 6 - 19
"...<BR> <FONT SIZE=-1>Become..." Line: 523 Column: 4 - 19
"...0px;"> <B><FONT COLOR=RED>News:<..." Line: 525 Column: 14 - 27
"... <FONT SIZE=-1><I>You..." Line: 529 Column: 14 - 27
"... <FONT SIZE=-1><I>I q..." Line: 535 Column: 14 - 27
"... <FONT SIZE=-1><I>I a..." Line: 541 Column: 14 - 27
"... <FONT SIZE=-1><I>it ..." Line: 560 Column: 22 - 35
"...nk to us: <FONT SIZE=-1><CODE>..."
The “width” attribute on the “table” element is obsolete. Use CSS instead.
Line: 241 Column: 1 - 54
".../script> <TABLE cellspacing=0 cellpadding=0 border=0 WIDTH=95%> <TR..." Line: 244 Column: 3 - 61
"...CENTER> <TABLE BORDER=0 BGCOLOR="#f2f2f2" cellspacing=4 WIDTH=100%> <..." Line: 282 Column: 56 - 73
"...</A></B>: <TABLE width=100%><TR><T..." Line: 303 Column: 49 - 66
"...</A></B>: <TABLE width=100%><TR><T..." Line: 324 Column: 50 - 67
"...</A></B>: <TABLE width=100%><TR><T..." Line: 341 Column: 47 - 64
"...</A></B>: <TABLE width=100%><TR><T..."
".../script> <TABLE cellspacing=0 cellpadding=0 border=0 WIDTH=95%> <TR..." Line: 244 Column: 3 - 61
"...CENTER> <TABLE BORDER=0 BGCOLOR="#f2f2f2" cellspacing=4 WIDTH=100%> <..." Line: 282 Column: 56 - 73
"...</A></B>: <TABLE width=100%><TR><T..." Line: 303 Column: 49 - 66
"...</A></B>: <TABLE width=100%><TR><T..." Line: 324 Column: 50 - 67
"...</A></B>: <TABLE width=100%><TR><T..." Line: 341 Column: 47 - 64
"...</A></B>: <TABLE width=100%><TR><T..."
The “width” attribute on the “td” element is obsolete. Use CSS instead.
Line: 246 Column: 9 - 53
"...> <TR> <TD WIDTH=30% valign=top class=mobile_invisible> <A HR..." Line: 282 Column: 78 - 91
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 303 Column: 71 - 84
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 324 Column: 72 - 85
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 341 Column: 69 - 82
"...=100%><TR><TD WIDTH=45%> <UL> ..."
"...> <TR> <TD WIDTH=30% valign=top class=mobile_invisible> <A HR..." Line: 282 Column: 78 - 91
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 303 Column: 71 - 84
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 324 Column: 72 - 85
"...=100%><TR><TD WIDTH=45%> <UL> ..." Line: 341 Column: 69 - 82
"...=100%><TR><TD WIDTH=45%> <UL> ..."
The “valign” attribute on the “td” element is obsolete. Use CSS instead.
Line: 246 Column: 9 - 53
"...> <TR> <TD WIDTH=30% valign=top class=mobile_invisible> <A HR..."
"...> <TR> <TD WIDTH=30% valign=top class=mobile_invisible> <A HR..."
Element “form” not allowed as child of element “font” in this context. (Suppressing further errors from this subtree.)
Line: 272 Column: 8 - 67
"...1> <FORM ACTION=/services/rendering/simplifier.mpl METHOD=POST> ..."
"...1> <FORM ACTION=/services/rendering/simplifier.mpl METHOD=POST> ..."
Stray end tag “font”.
Line: 371 Column: 6 - 12
".../A>! </FONT> ..."
".../A>! </FONT> ..."
The “nowrap” attribute on the “td” element is obsolete. Use CSS instead.
Line: 378 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> <A H..." Line: 398 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> ..." Line: 423 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 441 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 465 Column: 7 - 48
"...> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> <B>..." Line: 484 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 513 Column: 7 - 15
"...R> <TR> <TD NOWRAP> <..."
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> <A H..." Line: 398 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP CLASS=mobile_invisible> ..." Line: 423 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 441 Column: 6 - 49
"...R> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 465 Column: 7 - 48
"...> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> <B>..." Line: 484 Column: 6 - 49
"...TR> <TR> <TD ALIGN=RIGHT NOWRAP class=mobile_invisible> ..." Line: 513 Column: 7 - 15
"...R> <TR> <TD NOWRAP> <..."
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Line: 380 Column: 11 - 48
"... <IMG SRC=/images/teacher.jpg BORDER=0> ..." Line: 526 Column: 1 - 104
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
"... <IMG SRC=/images/teacher.jpg BORDER=0> ..." Line: 526 Column: 1 - 104
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
Element “pre” not allowed as child of element “i” in this context. (Suppressing further errors from this subtree.)
Line: 525 Column: 91 - 95
"...r example <PRE>sin^2(..."
"...r example <PRE>sin^2(..."
No space between attributes.
Line: 526 Column: - 101
"...0D%0A&x=0003&"</I></FONT><BR> ..."
"...0D%0A&x=0003&"</I></FONT><BR> ..."
Saw “<” when expecting an attribute name. Probable cause: Missing “>” immediately before.
Line: 526 Column: - 101
"...0D%0A&x=0003&"</I></FONT><BR> ..."
"...0D%0A&x=0003&"</I></FONT><BR> ..."
A slash was not immediately followed by “>”.
Line: 526 Column: - 103
"...%0A&x=0003&"</I></FONT><BR> <..."
"...%0A&x=0003&"</I></FONT><BR> <..."
Attribute “<” not allowed on element “img” at this point.
Line: 526 Column: 1 - 104
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
Attribute “i” not allowed on element “img” at this point.
Line: 526 Column: 1 - 104
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
End tag “font” violates nesting rules.
Line: 526 Column: 105 - 111
"...003&"</I></FONT><BR> <..."
"...003&"</I></FONT><BR> <..."
Attribute “i” not allowed on element “a” at this point.
Line: 540 Column: 22 - 98
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
Attribute “feel” not allowed on element “a” at this point.
Line: 540 Column: 22 - 98
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
Attribute “that” not allowed on element “a” at this point.
Line: 540 Column: 22 - 98
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
"...y 10</B>: <A HREF=http://www.algebra.com/algebra/homework/decimal-numbers/ I feel that>Please..."
End tag “div” seen, but there were open elements.
Line: 548 Column: 1 - 6
"...NT><BR> </DIV> Our ..."
"...NT><BR> </DIV> Our ..."
Unclosed element “i”.
Line: 525 Column: 28 - 30
"...T SIZE=-1><I>You ca..."
"...T SIZE=-1><I>You ca..."
Element “ul” not allowed as child of element “i” in this context. (Suppressing further errors from this subtree.)
Line: 558 Column: 2 - 5
"...d</A>. <UL> <..."
"...d</A>. <UL> <..."
End tag “td” seen, but there were open elements.
Line: 564 Column: 2 - 6
"... </UL> </TD> </TR>..."
"... </UL> </TD> </TR>..."
Warnings
The first occurrence of ID “t2” was here.
Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..."
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..." Line: 191 Column: 219 - 46
".../div></TD> <TD ID=t2 CLASS=middleoffonleft height=35><div a..."
Element name “g:plusone” cannot be represented as XML 1.0.
Line: 209 Column: 1 - 69
"...ender --> <g:plusone size="small" count="false" href="http://www.algebra.com/"></g:pl..."
"...ender --> <g:plusone size="small" count="false" href="http://www.algebra.com/"></g:pl..."
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Line: 380 Column: 11 - 48
"... <IMG SRC=/images/teacher.jpg BORDER=0> ..." Line: 601 Column: 19 - 156
"... <img src="https://pixel.quantserve.com/pixel/p-66wfHMHi013aM.gif" style="display: none;" border="0" height="1" width="1" alt="Quantcast"/> ..."
"... <IMG SRC=/images/teacher.jpg BORDER=0> ..." Line: 601 Column: 19 - 156
"... <img src="https://pixel.quantserve.com/pixel/p-66wfHMHi013aM.gif" style="display: none;" border="0" height="1" width="1" alt="Quantcast"/> ..."
Attribute “<” is not serializable as XML 1.0.
Line: 526 Column: 1 - 104
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
"...)</PRE>: <IMG SRC="https://www.algebra.com/cgi-bin/plot-formula.mpl?expression=sin%5E2%28z%29%0D%0A&x=0003&"</I></FONT>..."
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algebra.com Ping
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.
algebra.com TRACEROUTE
Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.