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)
anonymous
answered anonymously
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First, calculate the surface area of the box:
2(10*9) + 2(10*7) + 2(9*7) = 180 + 140 + 126 = 446 square inches
Next, subtract the surface area of the box from the total amount of cardboard purchased:
500 - 446 = 54 square inches
Cherese will have 54 square inches of cardboard left over.