12.4/6

Cost, revenue, and profit are in dollars andxis the number of units.

The average cost of a product changes at the rate

C'(x) =6x²+1

6

and the average cost of6units is $13.00.

(a) Find the average cost function.

C(x) =3x211

6

x+132

(b) Find the average cost of16units. (Round your answer to the nearest cent.)