Pre-Algebra Examples

 $\begin{array}{r} l = & 3 \\ w = & 5 x \end{array}$

Step 1

The perimeter of a rectangle is equal to the sum of all sides of the rectangle.

$l e n g t h + l e n g t h + w i d t h + w i d t h = 2 \cdot (l e n g t h) + 2 \cdot (w i d t h)$

Step 2

Substitute the values of the length $l = 3$ and width $w = 5$ into the formula for the perimeter of a rectangle.

$2 \cdot 3 + 2 \cdot 5$

Step 3

Simplify each term.

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Step 3.1

Multiply $2$ by $3$ .

$6 + 2 \cdot 5$

Step 3.2

Multiply $2$ by $5$ .

$6 + 10$

Step 4

Add $6$ and $10$ .

$16$ x