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)
Responses
54 in.2
426 in.2
446 in.2
406 in.2
The real answer is 54 square inches.
426 in.2
To find the total amount of cardboard needed to build the box, calculate the surface area of the box:
2(10*9) + 2(10*7) + 2(9*7) = 180 + 140 + 126 = 446 square inches
Since Cherese purchased 500 square inches of cardboard, the amount left over would be 500 - 446 = 54 square inches.