Answer
$81y^3\ cm^2$
Work Step by Step
$(9y^2)(9y)=81y{(2+1)}=81y^3$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 10 - Section 10.2 - Multiplication Properties of Exponents - Exercise Set - Page 711: 40
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