This document discusses analyzing graphs of functions. It reviews the vertical line test and defines domain and range from a graph. It explains that the domain is the shadow a graph casts on the x-axis, while the range is the shadow on the y-axis. Zeros of a function are found by setting the function f(x) equal to zero and solving. A graph can be increasing, decreasing, or constant over different intervals based on whether its slope is positive, negative, or zero.