Answer:the width is 160 ft
Explanation:
Let L represent the length of the rectangular base.
Let W represent the width of the rectangular base.
The length of the base measures 70ft less than twice the width. This means that
L = 2W - 70
The formula for determining the perimeter of a rectangle is expressed as
Perimeter = 2(L + W)
The perimeter of this base is 820ft. This means that
2(L + W) = 820
L + W = 820/2 = 410
Substituting L = 2W - 70 into L + W = 410, it becomes
2W - 70 + W = 410
3W - 70 = 410
3W = 410 + 70 = 480
W = 480/3 = 160