Answer:
17) Increase: (2, ∞)
Decrease: (-∞, -3)
Constant: (-3, 2)
18) Increase: (-∞, -2), (1, 3)
Decrease: (-2, 1)
Constant: (3, ∞)
Explanation:
When the line has a positive slope, it is increasing, when it has a negative slope, it is decreasing, and when it has a zero slope, it is constant.