## Precalculus (6th Edition) Blitzer

(a) is increasing on the interval $(0, +\infty)$; (b) has no interval where it is decreasing; (c) constant on the interval $(-\infty, 0)$
Based on its graph, the given function: (a) is increasing on the interval $(0, +\infty)$; (b) has no interval where it is decreasing; (c) constant on the interval $(-\infty, 0)$