Problem 9. (1 point) If f(x) = -x2+4x, find the following: (a) f(1) = (b) f (5) = (c) f(-1) = Answer(s) submitted: (incorrect) Problem 10. (1 point) If f( x) = - 1 -4x + 1 , find the following: . A. Yes, it is a function. . B. No, it is not a function. (a) f(0) = Answer(s) submitted: (b) f(15) = (c) f(11) = Answer(s) submitted: (incorrect) (incorrect) Problem 8. (1 point) Enter Yes or No in each answer space below to indicate whether Problem 11. (1 point) the corresponding equation defines y as a function of x. Consider the relation { (2, 1), (-1, 1), (7, 1), (9, 1), (-5, 1) }. _1. 9x = y2 2. 2 x|+y =7 Is this relation a function? (Write either "Yes" or "No") 3. x+9= 12 4. x2 + 2y = 10 What is the domain of this relation? { Answer(s) submitted: What is the range of this relation? Write "Does Not Exist" if the quantities do not exist. Answer(s) submitted: (incorrect) (incorrect)