Originally Posted by

**eXist** On your graph specifically we can see that x extends in the negative and positive direction infinitely.

So the domain of x: $\displaystyle x = \epsilon$ (All real numbers)

Similar problem for the range. On your graph (I can't really see the markings on the graph) but I'm assuming it's a sin function.

For simplicities sake I'm going to assume it's: $\displaystyle f(x) = sinx$

That means that the range of y is simply the range of the function: $\displaystyle f(x) = sinx$. And the range is: $\displaystyle |y| \le 1$

Now, on your graph, you have to check what numbers it's oscillating between.