Purplemath  Your Algebra Resource
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http://www.purplemath.com/  


Elizabeth Stapel  
Algebra modules provide lessons, practical tips, hints, worked examples, and point out common mistakes in basic triangle length (trigonometry) values, calculators (what model to buy), canceling units, domain and range, exponents, factoring quadratics, function notation, functions, graphing, induction proofs, intercepts, percent of increase/decrease/markup/markdown, piecewise functions, radicals (square roots), scientific notation, slope and graphing, slope and yintercept, slope of a straight line, solving inequalities (three methods), straightline equations, translation of word problems (distance problems, investment problems, mixture problems, and work problems), variables, and the vertical line test. Homework guidelines list examples, with commentary, of acceptable and unacceptable solutions. Also, an online study skills survey, and links to others' algebra sites.  


Levels:  Elementary, Middle School (68), High School (912) 
Languages:  English 
Resource Types:  Problems/Puzzles, Link Listings, Tutorials 
Math Topics:  Basic Algebra, Exponents/Roots, Fractions/Decimals/Percents, ProblemSolving, Communicating Math, Triangles and Other Polygons, Sequences and Sets, Functions, Trigonometry 
Math Ed Topics:  Specific Math Concepts/Techniques, Writing/Communication in Math 
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