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Some links are repeated for use with more than one lesson.

5.1  Relations and Functions

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.

5.2  Evaluating Functions

http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_FunctionsRelationsEvaluation.xml
This page contains a description of how to evaluate functions with practice problems.

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

5.3  Direct and Inverse Variation

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.

5.4  Graphs of Nonlinear Functions

http://fym.la.asu.edu/~tturner/MAT_117_online/Graph_features/Graph_features.htm
This page describes nonlinear functions and their graphs and has graph examples.

5.5  Functions Involving Square Roots

http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=107
This site contains a gizmo that explores functions involving square roots.

5.6  Exponential Growth and Decay

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.