Answer
10
Work Step by Step
$\sqrt 100$ equals 10. Because $\sqrt 100$ is really close to $\sqrt 99$, 10 is a good approximation for $\sqrt 99$.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - Chapter Review - Page 70: 36
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