Help?

If f = (1, 2), (2, 3), (3, 4), (4, 5),
g = (1, -2), (3, -3), (5, -5), and
h = (1, 0), (2, 1), (3, 2),

Find and state the domain.

1. f+g
2. f-g
3.f*g

domain of f = {1,2,3,4}

domain of g is {1,3,5}

any combination of f and g is only defined where both f and g are defined.

So, the domain for all of these problems is {1,3}