I think that it is CD overbar equals XY overbar i think but i really don't know.
Can’t see the full graph! But you can see there’s a small portion of the graph showing at the bottom which seems to be continuing making the range start from negative infinity. So, it has to be either the first or last option. You can check where the least and greatest x values that are graphed are to determine your domain
The answer for this one is x=17
