Question 142530
Well, simply we go to the formula for finding the perimeter(P) of a rectangle,
P=2(length + width)---------- eqn 1
We assigned "x" as the width measurement since it is unknown,and length= 2x-7ft,
being 7 less twice the width, make sense right?
Therefore substituting,
40= 2(2x-7 +x)
40=6x-14
x=(40+14)/6
x=9 ft, Width
And, L=2x-7=2(9)-7= 11ft, Length
In doubt? go back eqn 1,
P=2(L+W)
40=2(11+9)
40=2(20)
40=40 cool!
Thank you,
Jojo