On a number​ line, suppose the coordinate of A is​ 0, and AR=20. What are the possible coordinates of the midpoint of AR​?

Question

On a number​ line, suppose the coordinate of A is​ 0, and AR=20.

What are the possible coordinates of the midpoint of AR​?

Answer 1

Since A is at zero and AR is 20 units long, then point R could either be at 20 or it could also be at -20. What is the point halfway between 0 and 20? What is the point halfway between 0 and -20? Those are the possible midpoint locations of AR.