Music that expresses aspects of a nation's or regions culture is called what?

Folk music

When we refer to "folk music," we often are referring to well-known, old, traditional music styles in a culture for which we may not even know who composed the songs.  Folk music tends to be passed on by oral transmission more than by organized publication.  In a way it is the common music of a people or culture.

Your answer is 2 because you do keep change flip when you divide fractions