Answer:
b
Step-by-step explanation:
That's B: the surface area.
The volume of the sphere is V = (4/3)πr³; A = 4πr² happens to be the derivative of V with respect to r.
-35/2 x (-21/5)
-7/2 x (-21/1)
-7/2 x (-21) = 147/2= 78 1/2
b^2 + 3b - 4 + 4/(b-2)
see pic
