## Algebra 1: Common Core (15th Edition)

Martin used 400 ft of fencing to enclose a rectangular area in his backyard: $P=2(l+w)=400 \rightarrow l+w=200$ Isabella wants to enclose a similar area that is twice as long and twice as wide as the one in Martin's backyard. $P=2(2l+2w)$ $P=4(l+w)$ $P=4 \times 200$ $P=800$ ft The correct answer is F.