#### Answer

$13$

#### Work Step by Step

According to the textbook, a number, $a$, is a square root of another number, $b$, if $a^2=b$.
$13^2=169$, so $13$ is a square root of $169$.
Therefore: $\sqrt {169}=13$

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

$13$

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