#### Answer

$\frac{21}{a^{2}}$ is true.
$\frac{21}{a}$ is false.

#### Work Step by Step

$\frac{7}{a}$ * $\frac{3}{a}$=$\frac{7*3}{a*a}$=
$\frac{21}{a^{2}}$ is true.
$\frac{21}{a}$ is false.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$\frac{21}{a^{2}}$ is true.
$\frac{21}{a}$ is false.

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