Answer:
-3.75
Step-by-step explanation:
The rate of change is defined as the change in f(x) divided by the change in x
rate of change = (f(x2)-f(x1))/(x2-x1)
f(2) = 20 (1/4)^2 = 20 * 1/16 = 20/16 = 5/4
f(1) = 20 * (1/4)^1 = 5
rate of change = (5/4 -5)/(2-1)
Get a common denominator
= (5/4 - 20/4) /1
= -15/4
= -3 3/4
Change to a decimal
= -3.75
