<image 1>The graph of y = f(x) is shown in the figure above. The shaded region A has area a and the shadedregion B has area b . If g(x) = f(x) +3 .what is the average value of g on the interval [-2,4]?
['(a+b+3)/6', '(-a+b+3)/6', '(-a+b)/6+3', '(a+b)/6+3']