The demand function for a product is q d = p ^ 2 - 90p + 2,025, Where q_{d} equals the number of units demanded and p equals the price per unit, stated in dollars. a) What type of function is this? b) State the restricted domain and restricted range of the function. c) How many units will be demanded at the price of $30? d) Calculate f(22.5) . What does (22.5) represent? e) What price(s) would result in zero demand for the product