Answer
$b=20$
Work Step by Step
We are given the equation $-\frac{9}{10}b=-18$. Multiply both sides by $-\frac{10}{9}$.
$(-\frac{9}{10}b\times-\frac{10}{9})=b=-18\times-\frac{10}{9}=\frac{18\times10}{9}=\frac{180}{9}=20$
Therefore, $b=20$.
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 9 - Basic Algebra - 9.6 Solving Equations - 9.6 Exercises - Page 673: 66
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