Question

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

Answer 1

To find the amount of cardboard that Cherese needs to build the box, we need to find the surface area of the box. This can be found by adding up the areas of all six sides:

Surface area = 2(10 x 9) + 2(10 x 7) + 2(9 x 7)
Surface area = 180 + 140 + 126
Surface area = 446 square inches

So, Cherese needs 446 square inches of cardboard to build the box. If she purchases 500 square inches of cardboard, she will have 500 - 446 = 54 square inches of cardboard left over.