Answer
$13$
Work Step by Step
$\sqrt {144+25}$
$=\sqrt {169}$
$=13$ because $13^{2} = 169$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.3 - Page 48: 8
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