(a) For each of the functions below, determine which are polynomials, rational functions, or neither. For the graphs, assume you are seeing all of the important characteristics. (1) 1 I polynomial function vl y (2) I rational function VI V (3) x) = % - 7 Irational function v| y (4) 90) = \\/X + 9 I neither a polynomial nor a rational function VI y (b) Which of the following functions in part (a) are one-to-one functions? (Select all that apply.) (1) C] (2) C] (3) (4) x