Chapter 1 - Section 1.3 - More on Functions and Their Graphs - Exercise Set - Page 195: 7

(a) is increasing on the interval $(-\infty, -1)$; (b) has no interval where it is decreasing; (c) constant on the interval $(-1, +\infty)$

Based on its graph, the given function: (a) is increasing on the interval $(-\infty, -1)$; (b) has no interval where it is decreasing; (c) constant on the interval $(-1, +\infty)$