QUESTION 10 0.1 points If the production of an additional unit raises total revenue, the marginal revenue of that unit must be negative. O True O False QUESTION 11 0.1 poin Utility function is U(c) = 250co.. What is marginal utility at C = 25? QUESTION 12 0.1 p Questions 12-14 relate to the function f(X) = - x + 10x -50. What value of X maximizes f(x)? QUESTION 13 0. What is the value of f(x) at this value of X