The total revenue function for a product is given by Requals=745x ​dollars, and the total cost function for this same product is given by C=10,500+30x+x^2​, where C is measured in dollars. For both​ functions, the input x is the number of units produced and sold. a. Form the profit function for this product from the two given functions. b. What is the profit when 9 units are produced and​ sold? c. What is the profit when 23 units are produced and​ sold? d. How many units must be sold to break even on this​ product?