## Algebra 2 Common Core

Published by Prentice Hall

# Chapter 1 - Expressions, Equations, and Inequalities - 1-4 Solving Equations - Practice and Problem-Solving Exercises: 46

#### 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 $R=\frac{r_{1}r_{2}}{r_{1}+r_{2}}$.

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