For the following exercises for each pair of functions find a f g x and b g f x Simplify the results Find the domain of each of the results 42 f x 3x g x x 5 43 f x x 4 g x 4x 1 44 f x 2x 4 g x x 2 45 f x x 7 g x x 3 46 f x x g x x 9 47 f x 2x18 x 48 f x x 11 g x x x 4