15. Let p(:r) = {:1'.' 1)(:r 2H3 3] {I 4). Choose the correct statement: (a) For any number a, the equation 13(1) = 1-: always has at least one real solution. (In) There is some positive number k such that Whenever a is a number and k 5 u E k, then the equation 13(3) = a has 4 distinct real solutions. (c) Both (a) and (b) are false. ('1) PT?) = '3- (e) None of the above is true. 17. Let y = (1 1:)(2 :r) - - - {207 :12). Then E _ d3. .1:=1 (a) 1 (b) 207! {c} 2! (d) 205! (e) none of these :8. Suppose that f is a function with II?) = 5. If h is close enough to 0, then f(2 + h) is approximately (:1) ?) [5) H2) h (c) H?) 3h (:1) ?) 5h (e) none of these