## Algebra 2 (1st Edition)

$l=\frac{15}{2}$, or $l=7.5$
Given: Perimeter formula is $P=2l+2w$, $P=25$ centimeters, $w=5$ centimeters, and $l$ is unknown. $P=2l+2w$ $25=(2l)+(2\times5)=2l+10$ $15=2l$ $l=\frac{15}{2}$, or $l=7.5$