f Find f+g, f-g, fg and Determine the domain for each function. g f(x)=4x+9, g(x)=x+2 (Simplify your answer.) What is the domain of fg? OA. The domain of fg is (Type your answer in interval notation.) OB. The domain of fg is {}. (Use a comma to separate answers as needed.) OC. The domain of fg is 0. H- =(x) (Simplify your answer.) What is the domain of? OA. The domain of OB. The domain of g f is (Type your answer in interval notation.) g f is (Use a comma to separate answers as needed.) g