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This site gives a good review about combinations and compositions of functions

Explains how to combine functions using addition, subtraction, multiplication, and division.

By "simplifying" an algebraic expression, we mean writing it in the most compact or efficient manner, without changing the value of the expression. This website explores "Like terms" and how to combine them in different ways.

A general review guide for Simlifying Expressions.

Simplifying equations is often the first step to solving algebraic equations. Some methods that can be used to simplify an equation are explored on this web page.

Great website to learn about simplifying expressions. Gives you step by step instructions and also illustrations.