Idon’t understand what you’re supposed to do with the 12,15, and 8

Keira does not have enough wrapping paper to cover her package.

Step-by-step explanation:

Keep in mind that the length is 15 inches, the width is 12 inches, and the height is 8 inches.

You need to use those numbers to find the surface area of the package.  This can be done by finding the area of each side and adding them all together.  With a rectangular prism, there are three sets of two sides each.

One set has two sides that are the length times the width, or 15 inches times 12 inches.  This is 180 square inches for each of those two sides.

The next set of sides is the length times the height, or 15 inches times 8 inches.  This time, this is 120 square inches for each side.

For the last set, you need to multiply the width times the height.  12 inches times 8 inches is 96 square inches for each side.

Finally, add the surface areas for all the sides together.  180+180+120+120+96+96, which equals 792 square inches.

Keira only has enough wrapping paper for 750 square inches of surface area, so she doesn't have enough wrapping paper to wrap the package.