(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) . | polynomial function V l o? (2) rational function v V (3) f(x) = % 7 | rational function Vl a? (4) g(X) = y/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.)