Answer
$R=\dfrac{E}{I} - r$
Work Step by Step
Divide both sides of the equation by $I$ to obtain:
$\dfrac{E}{I}=R+r$
Subtract $r$ on both sides of the equation to obtain:
$\dfrac{E}{I} - r = R$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Review Exercises - Page 100: 86
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