HELP?

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 the following and state the domain?!

2a.f+g

2b.f-g

2c. f*g

2d. f/h

2e. G o F o h

HELP Pleasee!!
I'm Clueless :/

what's the problem? In each coordinate pair, the 1st number is in the domain, the 2nd in the range.

example:
2c:
f*g = (1,-4), (3,-12)
since 2 and 4 are not in the domain of g,
and 5 is not in the domain of f,
f*g is not defined there.

2e:
gofoh = g(f(h)
h(1) = 0 but g(0) is not defined
h(2)=1, f(1)=2, but g(2) is not defined
h(3)=2, f(2)=3, g(3) = -3, so (gofoh)(3) = -3