Answer
$e=\frac{Er}{R+r}$
Work Step by Step
Step 1. Given $\frac{E}{e}=\frac{R+r}{r}$, we have $Er=(R+r)e$
Step 2. Divide $R+r$ on both sides, we have $e=\frac{Er}{R+r}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - 1.6 Other Types of Equations and Applications - 1.6 Exercises - Page 149: 109
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