cheese needs to buy come cardboard 10 inches long and 9 inches wide, and 7 inches high. if she purchases 500 square inches of cardboard, how much will be left over
To calculate the surface area of the cardboard box, we will add up the surface area of each side.
The top and bottom of the box are both 10 inches by 9 inches, so each has a surface area of 10*9 = 90 square inches.
The front and back of the box are both 10 inches by 7 inches, so each has a surface area of 10*7 = 70 square inches.
The two sides of the box are both 9 inches by 7 inches, so each has a surface area of 9*7 = 63 square inches.
Adding up all the sides, we get a total surface area of 2*(90) + 2*(70) + 2*(63) = 180 + 140 + 126 = 446 square inches.
If she purchases 500 square inches of cardboard and the box requires 446 square inches, there will be 500 - 446 = 54 square inches left over.
Therefore, Cheese will have 54 square inches of cardboard left over.