Length = 502 ft Width = 212 ft Step-by-step explanation: Recall the formula for the perimeter of a rectangle of length "L" and width "W": Perimeter = 2 L + 2 W = 1428 ft Now, since the length is 78 ft more than twice the width, then we can write this in mathematical form as: L = 2 W +78 so, 2 W = L -7 8 and now replace "2 W" with it equivalent "L - 78" in the first perimeter equation and solve for "L": 2 L + L - 78 = 1428 3 L = 1428 + 78 3 L = 1506 L = 1506/3 L = 502 ft Then the width W can be obtained via: 2 W = L - 78 2 w = 502 -78 2 W = 424 w = 212 ft