This one is for 15 pts. the next question is for 20

Answer:
a = 0.75 m/s²
Explanation:
I am not gonna rewrite the stuff from previous answers, it's the same format.
a = average acceleration
v = final velocity = 9 m/s
v0 = initial velocity = 3 m/s
t = time = 8 s
a = (v-v0)/t
a = (9m/s - 3m/s) / 8s
a = 0.75 m/s²