Hello can someone please help me with this problem?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?