What happens if magnesium is added to hydrochloric acid (hci) in a single replacement reaction

Which of the following would not be taken into consideration when describing the quality of a sound

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)