Can someone please explain to me this: Direct Variation and Linear Functions
Best explanaion will get brainliest. I don't really understand this so please explain it well. And Thanks to anyone who can spare some time to help!

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

Which one ? is the answer and how to find this answer

Write and solve a real word problem that involves determining distance on a coordinate plane