Pre-Algebra Examples

 $\begin{array}{r} l = & 21 \\ w = & 21 + 12 \end{array}$

Step 1

The area of a rectangle is equal to the length times the width.

$(l e n g t h) \cdot (w i d t h)$

Step 2

Substitute the values of the length $l = 21$ and width $w = 21 + 12$ into the formula for the area of a rectangle.

$21 \cdot (21 + 12)$

Step 3

Add $21$ and $12$ .

$21 \cdot 33$

Step 4

Multiply $21$ by $33$ .

$693$