The total cost (in dollars) of producing x food processors is 000 = 1800 + 50x 0.6x2. (A) Find the exact cost of producing the 215t food processor. (B) Use the marginal cost to approximate the cost of producing the 21st food processor. (A) The exact cost of producing the 21st food processor is $|:t (B) Using the marginal cost, the approximate cost of producing the 21st food processor is $|:|. Use the four-step process to find f'(x) and then find f'( - 1), f'(6), and f'(9). f(x) = 2x2 - x - 3 f'(x) = f'(- 1) = (Type an integer or a simplified fraction.) f'(6) = (Type an integer or a simplified fraction.) f'(9) = (Type an integer or a simplified fraction.)For f(x) = 3x4 -12x3 + 6 nd the following. (A) f'(X) (B) The slope of the graph offat x =1 (C) The equation of the tangent line at x= 1 (D) The value(s) of x where the tangent line is horizontal (A) f'(X) = D (B) At X: 1, the slope of the graph off is (C) At x =1, the equation of the tangent line is y = D. (D) The tangent line is horizontal at x: :| (Use a comma to separate answers as needed.)