First find f + g, f - g, fg, and f/g. Then determine the domain for each function. f (x) = squareroot x - 6: g (x) = squareroot x - 7 (f + g) (x) = squareroot x - 6 + squareroot x - 7 What is the domain of f + g? [0, infinity) (- infinity, infinity) [7, infinity) [6, infinity)