Question 1122909
length is x
width is x+7
diagonal or hypotenuse is 13
so x^2+x^2+14x+49=169, squaring everything 
2x^2+14x-120=0
x^2+7x-60=0
(x+12)(x-5)=0
x=12, 5
the length is 5 ft, width 7 ft.