#### Answer

$A=k\sqrt{xy}$

#### Work Step by Step

Since $A$ is jointly/directly proportional to the square root of $x$ and $y$, we have:
$A=k\sqrt{xy}$
(where $k$ is a constant.)

Published by
Brooks Cole

ISBN 10:
1305115546

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

$A=k\sqrt{xy}$

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