Ricardo wants to cover a 8" by 10" by 5" box with contact paper How many square inches of caontact paper will he need? How much ribbon will he need if the bow itself adds 15"

80

To determine how many square inches of contact paper Ricardo will need, we need to calculate the surface area of the box. The formula for the surface area of a rectangular box is:

Surface Area = 2lw + 2lh + 2wh

Given the dimensions of the box as 8" by 10" by 5", we can substitute these values into the formula:

Surface Area = 2(8)(10) + 2(8)(5) + 2(10)(5)
Surface Area = 160 + 80 + 100
Surface Area = 340 square inches

Therefore, Ricardo will need 340 square inches of contact paper to cover the box.

To determine how much ribbon Ricardo will need, we need to calculate the perimeter of the box and add the extra 15" for the bow.

The formula to find the perimeter of a rectangular box is:

Perimeter = 2l + 2w + 2h

Given the dimensions of the box as 8" by 10" by 5", we can substitute these values into the formula:

Perimeter = 2(8) + 2(10) + 2(5)
Perimeter = 16 + 20 + 10
Perimeter = 46 inches

Adding the extra 15 inches for the bow, the total length of ribbon required would be:

Total Ribbon Length = Perimeter + Bow Length
Total Ribbon Length = 46 + 15
Total Ribbon Length = 61 inches

Therefore, Ricardo will need 61 inches of ribbon if the bow itself adds an extra 15 inches.