Why do you suppose our math class starts with ‘set theory’?

What will you learn in this section that will have practical application in your life?

Going a step further, why are the vast majority of college students, no matter what their field of study, required to take at least one math course?.

This is only a discussion post and does not to be in length of an essay. The response should be brief but answer needs to be in detail to the questions asked.