Question

The length of a rectangle is twiceits width.the perimeter of the rectangle is 126 feet

Answer 1

the length  is 42 ft and the width is 21ft since 21 is half of 42

Answer 2

P = 2(L + W)
P = 126
L = 2W

126 = 2(2W + W)
126 = 2(3W)
126 = 6W
126/6 = W
21 = W

L = 2W
L = 2(21)
L = 42

so the length (L) = 42 ft and the width (W) = 21 ft