Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 9 - Section 9.4 - Variation and Problem Solving - Exercise Set: 68

Answer

The horsepower to drive a boat needs to be eight times greater.

Work Step by Step

Let $h$ be the horsepower. Let $s$ be the speed of boat. $h=ks^3$ When speed is doubled, $k(2s)^3=8ks^2$ Since $ks^3=h$, $8ks^3=8h$ The horsepower to drive a boat needs to be eight times greater.
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