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Dragonfire0522
F
 The formula for area is length times height. If you add 1/2 to 2.5 for each of the boxes, you will be adding a total of 1 to the smallest in order to get the area of the largest. If you add 1 to 2.5, you get 3.5. Multiply 3.5 times 3.5, you get 12.25. That is how you get the answer.
irspow
The surface area of a cube is 6s^2  (6 times the area of one side)

In this case s=2.5+.5+.5=3.5

A=6(3.5)^2

A=73.5 in^2