Answer
$r=kst^3$
Work Step by Step
Using $x=kyz$ or the Joint Variation Model, then the given phrase translates to
\begin{array}{l}
r=kst^3
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 6 - Section 6.7 - Variation and Problem Solving - Exercise Set - Page 398: 29
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