Due Sunday by 11:59pm Points 14 Submitting an external tool Available after Nov 7 at 12am 5.5: Graded Homework ents Score: 0/14 0/14 answered Question 12 its Let f(a) = 4x - 12x + 5x + 15x7- 8x + 20. Use Descartes' Rule of Signs to answer the following questions. (a) List the possible number of positive real zeros (counting multiplicities) of f(a): (b) List the possible number of negative real zeros (counting multiplicities) of f(x): Drive (c) May anything definitive be said about the exact number of positive real zeros? Select an answer 365 (d) May anything definitive be said about the exact number of negative real zeros? Select an answer Question Help: Message instructor Submit Question here to search O 26OF Cle F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 O+ @ # $ A N 4 5 6 8 9 Q W E R P