#### Answer

$V(r)=2\pi r^3$

#### Work Step by Step

We know that the height is twice the radius, so $h=2r$
We know that the volume is given by:
$V=\pi r^2 h$
Therefore, the composite function will be:
$V(r)=\pi r^2 h=\pi (r^2) (2r)=2\pi r^3$

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Published by
Pearson

ISBN 10:
0-32193-104-1

ISBN 13:
978-0-32193-104-7

$V(r)=2\pi r^3$

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