## Precalculus: Mathematics for Calculus, 7th Edition

A) $S(2)=50.27$ (rounded), $S(3) = 113.1$ (rounded) B) Surface area of a sphere.
A) Plug in 2 and 3 for "r" and solve the problem, and rounding to two places will give you the surface area. $S(2)=4\pi(2)^2$ $S(2)=4\pi(4)$ $S(2)=50.27$ $S(3)=4\pi(3)^2$ $S(3)=4\pi(9)$ $S(3)=113.1$ B) The problem states that the surface area is represented by S. The formula given is used to solve for the surface area