Answer:
21
Step-by-step explanation:
acceleration,A = 7
F = kA
First expression: 45 = 5k, k = 9
therefore, when F = 63, A = 63/9 = 7
Answer: 64 square mm
x=1.5
-17
first find g(5) = -2(5)+5 = -5
then f(-5) = 4(-5)+3 = -17