## Algebra 2 (1st Edition)

$w=20$
Given Information: perimeter formula is $P=2l+2w$. $P=100$ meters, $l=30$ meters, and $w$ is unknown. $P=2l+2w$ When we substitute in the values for $P$ and $l$: $100=(2\times30)+(2w)=60+2w$ $40=2w$ $w=20$