For this question I'm not sure what I have to do
Cool question! Think of this like a production line - The composite function is really just two functions performed one after the other. The question is asking what can come out the end of the conveyor belt, given what we are putting in to the conveyor belt (that is, the domain given the range).
Consider the first as an example. Putting the numbers -2, -1, 0, 1, 2 into the first box, \(f(x)=x^2\), yields the numbers 0, 1 and 4. When you put those
numbers in the second box, \(g(x)=2x-3\), you get:
So the range of the composite function in the first case is -3, -1, 5. Note that it might be a little weird writing a discrete range like this, but since we have a finite set of numbers given in the domain, we'll get a finite set of numbers as our range