Question

What is the rate of change from x = π to x = 2π?

A. 8 over pi

B. pi over 8

C. negative 8 over pi

D. negative pi over 8

Answer 1

f(x) = -4cos(x)

average rate of change is taking the slope between those points

= (-4 - 4)/(2π - π)
= -8/π

the answer is C.