11. Let 9(33) = 3\" :55. Which of the following intervals must contain a solution of the equation 9(3) = 0'? (a) [1,1] (6) [0,2] ((2) [1,2] ((1) [2,3] (6) none of the above is true 12. Suppose the function f is continuous on the closed interval [0,4] and f(0) = 1, f(1) = 2, f(2) = 0, f(3) = 3, f(4) = 3. Which of the following is true? (a) f has exactly one zero on [0, 4] (b) f has more than one zero on [0, 4] (c) f has more than two zeros on [0, 4] (d) f has exactly two zeros on [0,4] (9) none of these