Problem #9 (10 points) Determine whether the function is one-to-one and onto? a) Let R be a set of real numbers and let S : R+R be defined by S(x) = 3x - 4. b) Let Z be a set of all integers and let 1:2 Z be defined by f(x) = x + x. Problem #10 (10 points) Let f and g be functions from positive integers to positive integers defined by the equations: S (n)=n, g(n) = 2". Find the compositions ff.gg, fg and gof