Answer
400
Work Step by Step
$20^2= 400$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 9 - Section 9.3 - Area, Volume, and Surface Area - Exercise Set - Page 638: 70
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