Number in standard form 3 hundreds 17 tens 5 ones

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.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

I’m stuck on this equation, anyone got the answer?