http://www.mcelroytutoring.com/blog-post.php?id=281
http://www.erikthered.com/tutor/facts-and-formulas-0.pdf
http://www.freevocabulary.com/SATmath.pdf
http://www.erikthered.com/tutor/
http://www.syvum.com/sat/index.htm#s1
http://www.studybeans.com/sat/math_equations.html
http://www.apluspublishing.com/aplus4.html
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