The volume of a hemisphere is 144 pi. find the radius and total surface area.

Formula of the Volume of a hemisphere:
V = r³
144 = r³
Multiply by 3 to cancel fraction in the right side
144 × 3 = 2 r³
432  = 2r³
Divide by 2 on either sides to isolate r³
= r³
2 and  cancel out
216 = r³
Take cube root to find the radius
= 
6 = r
Radius is 6 units

The formula of the surface area of a hemisphere is:
S.A = 2r² + r²
       = (6)² + (6)²
       =2 × 36 + 36
       = 72 + 36
       = 108 units²  (in terms of )
       ≈ 339.12 units²

Surface area = 108 units

Iam guessing c. or d.