## Precalculus (6th Edition) Blitzer

Use the given graph, we have: a. the domain of f is $(-\infty, \infty)$ b. the range of f is $(-\infty,4]$ c. the x-intercepts are $x=0, 4$ d. the y-intercept is $y=0$ e. the interval where f is increasing is $(-\infty,2)$ f. the interval where f is decreasing is $(2,\infty)$ g. the number at which f has a relative maximum is $x=2$ h. the relative maximum of f is $y=4$ i. $f(-1)=-5$