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
after building the box?
First, let's calculate the surface area of the box:
2(10x9) + 2(10x7) + 2(9x7) = 180 + 140 + 126 = 446 square inches
Cherese purchased 500 square inches of cardboard, so 500 - 446 = 54 square inches will be left after building the box.