9. The profit P for a video-game maker is given by P =-.002x +90x - 150,000, where P is the total profit in dollars and

9. The profit P for a video-game maker is given by P =-.002x² +90x - 150,000, where P is the total profit in dollars and x is the number of units sold.a. If zero units are sold, what is the profit? What does this say about the costs of the operation? b. What level of production yields the maximum profit? What is that profit?