The graph of two functions, f and g, is illustrated below. Use the graph to answer parts (a) through (f). 10 f(x) -10 y (2/3) (2-1) (4) g(x) (4,-5) (6,-1) (6-5) X HO (a) (f+g)(2) = (Simplify your answer.) (b) (f+g)(4) = (Simplify your answer.) (c) (f- g)(6)= (Simplify your answer.) (d) (g-f)(6) = (Simplify your answer.) (e) (fog)(2) = (Simplify your answer.) (4) = (Simplify your answer.)