Answer
$R=\frac{r_{1}r_{2}}{r_{1}+r_{2}}$
Work Step by Step
We can isolate $R$ by dividing both sides by $(r_{1}+r_{2})$. We have $\frac{R(r_{1}+r_{2})}{(r_{1}+r_{2})}=\frac{r_{1}r_{2}}{(r_{1}+r_{2})}$ is $R=\frac{r_{1}r_{2}}{r_{1}+r_{2}}$.
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 1 - Expressions, Equations, and Inequalities - 1-4 Solving Equations - Practice and Problem-Solving Exercises - Page 31: 46
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