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 $13\times13=169$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 6 - Review - Page 460: 43
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