Charis needs to buy some cardboards build a box 10 inches long 9 inches wide and 7 inches high if she purchases 500 in.² of cardboard how much will be left over
The surface area of the box can be calculated by finding the sum of the surface areas of all its sides.
Surface area = 2lw + 2lh + 2wh
Surface area = 2(10*9) + 2(10*7) + 2(9*7)
Surface area = 180 + 140 + 126
Surface area = 446 in²
If Charis purchases 500 in² of cardboard and the surface area of the box is 446 in², she will have 500 - 446 = 54 in² of cardboard leftover.