#### Answer

$A= \frac{21}{r}$

#### Work Step by Step

Since $A$ varies inversely with $r$, we have:
$A= \frac{k}{r}$
We are given: $A=7$ and $r=3$, so we have:
$7= \frac{k}{3}$
$k=7*3=21$
So the equation is:
$A= \frac{21}{r}$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$A= \frac{21}{r}$

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