The surface area of a sphere is numerically equal to twice its volume. What is the radius of the sphere?
A = 4 π r2 V = (4/3) π r3
4 π r2 = (2)(4/3) π r3
divide both sides by 4 π r2
1 = (2/3) r
r = 3/2
r = 1.5
.
+1552 
