Algebra 1 - 3rd Edition

Chapter 5: Nonlinear Functions

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http://www.mathwarehouse.com/algebra/relation/math-function.php
This site explains relations and functions and has practice problems.

http://www.purplemath.com/modules/fcns.htm
This page contains a written lesson explaining the differences between relations and functions and how to tell them apart.

http://www.sparknotes.com/testprep/books/newsat/chapter19section11.rhtml
This site explains how to evaluate functions and how to use them for different operations.

http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=129
This page contains a gizmo that has a graph displaying direct and inverse variation.

http://hotmath.com/help/gt/genericalg1/section_9_8.html
This site contains practice problems for direct and inverse variation.

http://www.regentsprep.org/regents/math/algebra/AE7/ExpDecayL.htm
This page explains exponential growth and decay with notes, tables, and graphs.

http://hotmath.com/help/gt/genericalg1/section_9_6.html
This page contains practice problems about exponential growth and decay.