Answer: (D) 4
Step-by-step explanation:
Average rate of change means slope (m) from point a to point b.
when x = 5, y = -2 → coordinate (5, -2)
when x = 7, y = 6 → coordinate (7, 6)
slope (m) = [tex]\dfrac{6-(-2)}{7-5} = \dfrac{8}{2}=4[/tex]
