Acompany estimates its total profit (profit = total revenue minus total cost) as p(x) = 2x5 − 3x4 − 5x2 − 2, where p is in thousands of dollars and x is the number of years elapsed since the company was founded. how many times can the total profit become exactly zero? hint: use descartes's rule of signs. a. 2 or 0 b. 5 or 3 or 1 c. 3 or 1 d. 1