Hi there!

Use the kinematic equation to solve for acceleration:

Where:
vf = final velocity
vi = initial velocity
t = time
Plug in the given values:

This is how i worked it out.
Good Luck
Answer:
i got 32 weeks??
Step-by-step explanation:
Answer:
-12 feet per second
Step-by-step explanation:
average rate of change over [0.75, 1.25] = 
f(1.25) - f(0.75) = 4 - 10 = -6
1.25 - 0.75 = 0.5
=
= -12