Video Instruction     Functions Section 2.1 The definition of a function; Determining if a relation is a function (7:53) Section 2.2 Determining if a graph represents a function; Vertical Line test (7:21) Section 2.3 Finding the Domain and Range by using the graph of a function (7:21) Section 2.4 Evaluating a function (6:24) Section 2.5 Finding the Domain of a Function (7:09) Section 2.6 A Library of Function (5:32)