Answer
$81$
Work Step by Step
An exponent of $2$ means that the given factor is multiplied two times.
Thus,
$9^2 = 9(9) = 81$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - Chapter Review - 1-2 Order of Operations and Evaluating Expressions - Page 69: 20
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