When wrapping a birthday gift for his mother kemji adds additional 2.5 square feet of gift wrap to allow for overlap. how many squares feet of gift wrap will kenji use to wrap a gift 3.5 ft long 18 in wide and 2 ft high?

For this case, the first thing to do is find the surface area of a rectangular prism.
 A = 2 * (h) * (l) + 2 * (h) * (w) + 2 * (w) * (l)
 Where,
 h: height
 l: long
 w: width
 Substituting values:
 A = 2 * (2) * (3.5) + 2 * (2) * (18/12) + 2 * (18/12) * (3.5) 
 A = 30.5 ft ^ 2
 Then, the amount of wrapping paper is:
 W = A + 2.5
 W = 30.5 + 2.5
 W = 33 ift ^ 2
 
 kenji will use 33 ft ^ 2 of gift wrap to wrap a gift