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

4.1 Relations and Functions

http://www.purplemath.com/modules/fcns.htm

This page contains a tutorial and practice problems on determining if a relation is a function.

http://education.yahoo.com/homework_help/math_help/problem_list?id=miniprecalcgt_1_1

This page is a quiz with a step-by-step tutor on key concepts involving functions.

http://www.algebralab.org/studyaids/studyaid.aspx?file=Algebra1_12-1.xml

This page contains an interactive tutorial on functions.

4.2 Function Operations

http://www.analyzemath.com/graphing_calculators/operations_on_functions.html

This page contains a calculator that will graph functions and the functions that result from performing operations on them.

4.3 Identity, Constant, and Inverse Functions

http://www.purplemath.com/modules/invrsfcn.htm

This page contains a full description of inverse functions, graphing them and the relationship between a function and its inverse.

http://www.themathpage.com/aPreCalc/inverse-functions.htm

This page contains an interactive lesson on inverse functions.

4.4 Special Functions

http://www.intmath.com/Functions-and-graphs/Functions-graphs-intro.php

This page contains lessons, history, and applications of different types of functions.

4.5 Transformations of Functions

http://www.regentsprep.org/Regents/mathb/7b3/funcresource.htm

This page contains some suggestions for activities on transformations of functions.