Answer:
-1/2
Step-by-step explanation:
In a function, the rate of change from x = a to x = b is
rate of change = [f(b) - f(a)]/(b - a)
Here we have
a = 1, f(a) = 4
b = 5, f(b) = 2
rate of change = (2 - 4)/(5 - 1)
rate of change = -2/4 = -1/2
