### Home > CC4 > Chapter 8 > Lesson 8.1.6 > Problem 8-85

8-85.

Solve each equation below for the indicated variable. Homework Help ✎

Solve for

*l*:*P*= 2*l*+ 2*w*Solve for

*π*:*C*= 2*πr*Solve for

*r*:*V*=πr ^{3}

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

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

Use division property of equality to isolate *π*.

What is the inverse operation of *r*³?