Answer
21
Work Step by Step
To solve for x use cross multiplication or simplify the equitable fraction and go from there. $\frac{9}{12}=\frac{3}{4}$ therefore $\frac{x}{28}$ has to equal \frac{3}{4}
$3\times7=21$ and $4\times7=28$
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
Chapters 1-5 - Cumulative Review Exercises - Page 379: 21
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