### Home > INT1 > Chapter 8 > Lesson 8.1.6 > Problem8-85

8-85.

Solve each equation below for the indicated variable.

Review Appendix A on solving equations and the beginning of chapter 6.

1. Solve for $l$: $P = 2l + 2w$

Add and subtract terms before you multiply and divide to isolate the variable.

2. Solve for $π$ : $C = 2πr$

Use division property of equality to isolate $π$.

3. Solve for $r$: $V = \frac { 4 } { 3 }πr^3$

What is the inverse operation of $r^3$?