Do 5+3 and 3+5 represent the same expression explain

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.

Need asap. solve for the following inequality

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd