7/2 = x/11 does anyone know the answer?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

What statement is true? 2x^2-9x+2=-1