so there are two problems on my pre-calc test that carries over into tomorrow. One of them:

If the function f(f(x)) = X represents every x for the domain, what will it's symmetry be? It's function?

It's a ridiculously vague question and I don't even know where to begin.

The second one:

If the domain and range of a function are (a, b) and (c,d) and a < b and c < d,

what is the domain and range of the function f(x) = k (-1/3x) - 1

Any ideas???