Answer
29
Work Step by Step
$21^2+20^2=x^2$
$441+400=x^2$
$841=x^{2}$
$\sqrt {841}=x$
$29=x$, because $29\times29=841$
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: 44
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