I’ve attached a photo with my work ....
Hope it helps!!
Answer:
2) Exact
3) Exact
4) Exact
5) Approximation
Step-by-step explanation:
I hope this helps you
Area=6^2pi=36pi
Circumference =2.6pi=12pi
Dr/dt= 8cmM-¹
dA/dt = ?
but A= πr²
so dA/dr =2πr
but recall
dA/dt = dA/dr • dr/dt
dA/dt = 2πr • 8cmM-¹
dA/dt = 2×π×39 ×8 = 624cm²M-1
