The topic is Domain and Range Introduction. I don't know much about graphs. My teacher just dropped this off with no explanation or lesson before hand. So I have no idea what's going on.

According to the given graph, the function goes from x = 1 to x = 4.
Remember that x-values form the domain.
Therefore, the domain interval would be
[tex]\lbrack1,4)[/tex]Or
[tex]1\leq x<4[/tex]Because the left limit is closed and the right limit is open.