algebra1

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Betty wishes to bulid a rectangular dog runalong the side of her garage. The garagewill be on of the longer sides of the run. If she has 50 feet of fenccing and wishes the run to be 3 times longer than i is wide, how many square feet will the fencing enclose?
a. 80 sq. ft
b.117 1/8 sq. ft
c. 250 sq. ft
d. 300 sq. ft
e. 468 3/4 sq. ft
please help me....

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