F (x) = 3x + 2 and g (x) = 2x - 1. Find (g- f(x) I don't understand and its all so confusing, my teacher I like him a lot but he is too smart and sometimes he can forget that and speak so fast than ask you "got all that copied down"? I'm really lost on this please help

I just need the explanation part, and then anything else please! thanks :)

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.