A box manufacturer needs to make a cardboard box without a lid. The box must have a base of 4 feet by 3 feet and a height of 2 feet. How much cardboard will be needed to make the box?
The base requires (4 ft)*(3 ft) = 12 ft^2. The sides require (2 ft)*(2*(4 ft +3 ft)) = 28 ft^2. The total area of the box is (12 +28) ft^2 = 40 ft^2. . . . . . . . . 1st selection
