Let f(x) =-2x-7 and g(x)=-4x+3 find (f•g)(-5)

Which of the symbols correctly relates the two numbers below check all that apply 6? 6

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.

Don't know how to find x given these segment lengths