Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 6 - Review: 44

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 $29\times29=841$
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