PLEASE SOLVE THIS WORKSHEET AND PLEASE ONLY DO IT HAND WTITTEN WITH BLUE OR BLACK INK PEN PLEASE, REMEMBER I ONLY WANT IT DONE HAND WRITTEN AND WITH BLUE OR BLACK IN PEN, PLEASE WRITE VERY CLEARLY, THANK YOU.

6) Suppose that the cost (in dollars) to manufacture x items is given by the following function: C(x) = x3 - 0.45x2 + 0.35x + 20000. The revenue for one item is $18,000 . a) Find the production level that will maximize the profit. Round your answer to the nearest integer. X = b) Use the answer in part (a) to calculate the maximum profit