(1 point) Let f(x) = [(2x + 1)/3]. We learned about the set of all images for a given set. So if your answer has more than one number in it, list the values separated by commas. (a) f({4}) = { 3 (b) f ( {-3} ) = { -5/3 (c) f ( {4, 7}) = { 3,5 (d) f ( {-3, -9, 4}) = { -5/3, -17/3, 3