Question

LeAnn wants to giftwrap a present she got for her little brother. How many square inches of giftwrap will be needed to cover a box that is 5in x 7in x 3in?

Answer 1

Posted a picture showing the solution. Everything is on it, including calculations.
The answer is 142 square inches (or 142 in.^2) same thing.

Hope this helps!

Answer 2

6 sides to a cube

 2 are 5*3 = 15*2 = 30

2 are 5*7 = 35*2=70

2 are 3*7 = 21*2=42

30+70+42 = 142 square inches total area