Your weekly cost (in dollars) to manufacture x cars and y trucks is c(x, y) - 450,000 + 9,000x + 5,000y. (a) what is the marginal cost of a car? of a truck? hint (see example 1.] marginal cost of a car $ marginal cost of a truck $ (b) describe the graph of the cost function c. hint (see example 7.) the graph is a select with x-interceptx and z-intercept z = (c) describe the slice x = 10. the slice x 10 is the straight line with equation z what cost function does this slice describe? it describes the cost function for the manufacture of -select- b f select production is held fixed at 10 cars per week. (d) describe the level curve 750,000 the level curve z = 750,000 is the straight line what does this curve tell you about costs? it describes the amount of money needed to maintain production of 750,000 cars and trucks per week. it describes cost of producing a certain number of trucks if the number of cars produced each week is fixed at 750. it describes cost of producing one more truck when the number of cars produced each week is fixed at 750. describes the numbers and m oon m achine to maintain weaklysten