I need the correct answers to some of these since mine were incorrect

Your weekly cost (in dollars) to manufacture X cars and y trucks is C(x, y) = 320,000 + 8,000x + 4,000y. (a) What is the marginal cost of a car? of a truck? HINT [See Example 1.] marginal cost of a car $ 8000 v marginal cost of a truck $ 4000 J (b) Describe the graph of the cost function C. HINT [See Example 7.] The graph is a plane v V with x-intercept x = -40 , y-intercept y = -80 'I , and z-intercept z = 32000 (c) Describe the slice x = 10. The slice x = 10 is the straight line with equation 2 = 400000 + 4000y v What cost function does this slice describe? It describes the cost function for the manufacture of trucks v q if car v q production is held xed at 10 cars per week. (d) Describe the levei curve 2 = 580,000. The level curve 2 = 580,000 is the straight line 4000y + 8000x X What does this curve tell you about costs? 0 It describes cost of producing one more truck when the number of cars produced each week is xed at 580. Q It describes the amount of money needed to maintain production of 580,000 cars and trucks per week. 0 It describes cost of producing a certain number of cars if the number of trucks produced each week is xed at 580. 0 It describes cost of producing a certain number of trucks if the number of cars produced each week is xed at 580. Q It describes the number of cars and trucks you can manufacture to maintain weekly costs at $580,000