### Chapter 5 - Functions

This chapter discusses functions. It contains the following sections:
- section 5.1 - In this section we introduce functions,
the function machine concept, functional notation and different ways to express functions.
We also talk about composite functions and inverse functions.
- section 5.2 - This is a reference section that
shows the graphs of eight types of functions.
- section 5.3 - This is a reference section that
gives many details about the eleven functions that are built into the Algebra Coach
and into all scientific calculators.