Jesse S. answered 09/17/17
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Area = length * width
width = x
length - x+10
Area =x(x+10)
200 =x2 +10x
x2 +10x -200 =0
(x+20)(x-10)=0
x=-20 and x=10
width= x= 10 yards
length= x+10 =10+10 = 20yards