The width of a rectangle measures left bracket, 2, point, 4, d, minus, 7, point, 6, f, right bracket(2.4d−7.6f) centimeters, and its length measures left bracket, 7, point, 2, d, minus, 4, point, 9, f, right bracket(7.2d−4.9f) centimeters. Which expression represents the perimeter, in centimeters, of the rectangle?
Answer