## College Algebra 7th Edition

Published by Brooks Cole

# Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises - Page 164: 24

#### Answer

$S=9pq$

#### Work Step by Step

Since $S$ is jointly proportional to $p$ and $q$, we have: $S=kpq$ We are given: $S=180$ and $p=4$ and $q=5$, so we have: $180=k*4*5$ $180=20*k$ $k=180/20=9$ So the equation is: $S=9pq$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.