Solve each equation below for the indicated variable.

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

   Hint (a):

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

2. Solve for $π$ : $C = 2πr$

   Hint (b):

   Use division property of equality to isolate $π$.

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

   Hint (c):

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