A rectangular box is to have a square base and a volume of 20 ft3. The material for the base costs
, the material for the sides costs
, and the material for the top costs
. Letting x denote the length of one side of the base, find a function in the variable x giving the cost of constructing the box.
A) 
B) 
C) 
D) 
E) 
Correct Answer:
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