Question

A shoe box in the shape of a rectangular prism measures 12 inches by 7 inches by 4 inches. What is the surface area of the shoe box?

Answer 1

I don't think this goes in Spanish, but okay. 

The surface area of any object can be found by adding together the area of all of it's sides. 
This box is a rectangular prism, so it has 6 sides- one on top and bottom that are identical, 2 on the sides that are identical, and 2 on the ends that are identical. \
So, this box has two 12*4 sides, two 12*7 sides, and two 7*4 sides. The solution would be:
2(12*4)+2(12*7)+2(7*4)
2(48)+2(84)+2(28)
96+168+56
=320