Chapter 1: Section 2: Functions
No. 9 Determining Whether a Given Relation Describes a Function
No. 19 Determining Whether a Given Equation Represents y as a Function of x
No. 21 Determining Whether a Given Equation Represents y as a Function of x
No. 31 Evaluating a Function at Given Values
No. 43 Evaluating a Piecewise Defined Function at Given Values