The Ratio of an area?

Question

Part 1:
Sphere 1 has surface area A1 and volume V1 and sphere 2 has surface area A2 and volume V2. If the radius of sphere 2 is 2.14 times the radius of sphere 1, what is the ratio of the areas A2/A1 ?

Part 2:
What is the ratio of the volumes V2/V1?

Answer 1

Area varies as the square of radius (A = 4(pi)r^2), and volume varies as the cube of radius (V = 4/3(pi)r^3). So the ratio of the areas is 2.14^2, and the ratio of the volumes is 2.14^3.

Answer 2

Part 1: (2.14)^2
Part 2: (2.14)^3