Find f+g, f-g, fg, and -. Determine the domain for each function. g f(x)=x; g(x)=x-18 (f-g)(x)=x-x+18. (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 off-g is [0,). (Type your answer in interval notation.) OC. The domain off-g is 0. (fg)(x)=xx-18x (Simplify your answer.) What is the domain of fg? A. The domain of fg is {}. (Use a comma to separate answers as needed.) The domain of fg is [0,). (Type your answer in interval notation.) OC. The domain of fg is 0. 116