Why does the quote below stand out?

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)