Answer
$r=kst^3$
Work Step by Step
Because $r$ varies jointly as $s$ and the cube of $t$, we equate $r$ to a constant multiple of $s$ and $t^3$:
$r=kst^3$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Section 9.4 - Variation and Problem Solving - Exercise Set - Page 664: 29
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