Which expression has a value of 8

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 percent of 18 is 24? and plz explain thx.

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)