First, calculate the surface area of the box:
Surface area = 2(lw + lh + wh)
Surface area = 2(10*9 + 10*7 + 9*7)
Surface area = 2(90 + 70 + 63)
Surface area = 2(223)
Surface area = 446 in²
Sherry purchased 500 in² of cardboard, so the amount left over would be:
500 - 446 = 54 in²
Sherry will have 54 in² of cardboard left over after building the box.
Sherry needs to buy some cardboard to 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
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