3.7, good video on Greatest Possible error. http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-170s.html
3.8 (two videos) about square roots… http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0308
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