6. Claire draws a vertical number line diagram and graphs two points: -10 and 10. She writes the following related story: "These two locations represent different elevations. One location is 10 feet above sea level, and one location is 10 feet below sea level. On a number line, 10 feet above sea level is represented by graphing a point at 10, and 10 feet below sea level is represented by graphing a point at -10."​