Chapter 1.1, Problem 7QR

Which symbols correctly expresses the order in which the points A, B and X lie on the given line, A-X-B or A-B-X?

Have you ever used a map with a rectangular coordinate system? Describe the map and how you used it.

An airplane flies from Naples, Italy, in a straight line to Rome, Italy, which is 120 kilometers north and 150 kilometers west of Naples. How far does the plane fly?