Consider the function below. f(x, y) = In(x + y - 9) (a) Evaluate f(6, 4). (b) Evaluate f(e, 9). (c) Find the domain of f. Ox > 9 Oy> 9 Ox +y > 9 Ox + y - 9 > 1 Ox > 9, y > 9 (d) Find the range of f. (Enter your answer using interval notation.)

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