Cherese needs to buy some cardboard to build a box 10 inches long, 9 inches wide, and 7 inches high. If she purchases 500 square inches of cardboard, how much will be left over?(1 point)
First, we need to find the surface area of the box.
Surface Area = 2lw + 2lh + 2wh
Surface Area = 2(10)(9) + 2(10)(7) + 2(9)(7)
Surface Area = 180 + 140 + 126
Surface Area = 446 square inches
Since Cherese purchased 500 square inches of cardboard, the amount left over will be:
500 - 446 = 54 square inches of cardboard left over.