Answer
$$36\pi $$
Work Step by Step
We are given the following equation:
$$ V\left(r\right)=4\pi \:r^2 $$
Thus, when $r$ is 3, we find:
$$ 4\pi 3^2\\ 36\pi $$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 7 - Functions and Graphs - 7.1 Introduction to Function - 7.1 Exercise Set - Page 450: 63
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