College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 1 - Equations and Inequalities - Exercise Set 1.3 - Page 135: 67



Work Step by Step

$S=P+Prt$ Solve for $r$ Add $-P$ to both sides. $S-P=P+Prt-P$ $S-P=Prt$ Divide by $Pt$ both sides $\frac{S-P}{Pt}=\frac{Prt}{Pt}$ $\frac{S-P}{Pt}=r$ $r=\frac{S-P}{Pt}$
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