a. Dominio = {3,5,8,10,15,21,33}\left\{3,5,8,10,15,21,33\right\}{3,5,8,10,15,21,33}, Rango={0,1,2,3}\left\{0,1,2,3\right\}{0,1,2,3}.
b. Sí, si es función.