K Find f g f g fg and Determine the domain for each function 9 f x x 9 g x 4x f g x 4x x 9 Simplify your answer What is the domain off g OA The domain off g is Use a comma to separate answers as needed B The domain of f g is 0 00 Type your answer in interval notation OC The domain off g is f g x 4x x 9 Simplify your answer What is the domain of f g A The domain of f g is B The domain off g is Oc The domain off g is fg x Simplify your answer 0 00 Type your answer in interval notation Use a comma to separate answers as needed