4(5 + 4n) = 84
Pls help I need shown work to pls

Mary had at least an 80% on her test write an inequality to represent this situation

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.

For what values of x is x2 + 2x = 24 true?