M is less than 3 in this equation (because the "mouth" is eating the bigger variable, 3) so the graph goes from 3 and down. The circle is open because the symbol is (<) I think of it like this: the closed circle has more to it because you have to color it in. The (≥) symbol also has more to it because it has a line below it. So maybe use that to think about. Have a nice day!
