#### Answer

13

#### Work Step by Step

$12^2+5^2=x^2$
$144+25=x^2$
$169=x^{2}$
$\sqrt {169}=x$
$13=x$, because $13\times13=169$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

13

$12^2+5^2=x^2$
$144+25=x^2$
$169=x^{2}$
$\sqrt {169}=x$
$13=x$, because $13\times13=169$

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