## College Algebra 7th Edition

(a) $S(2)=16\pi \approx 50.27$ $S(3)=36\pi \approx 113.10$ (b) surface areas
(a) We are given: $S(r)=4\pi r^2$ $S(2)=4\pi (2)^2=16\pi \approx 50.27$ $S(3)=4\pi (3)^2=36\pi \approx 113.10$ (b) The values in (a) represent the surface areas of a sphere of radius $2$ and $3$ units, respectively..