How many degrees are there if you add up the internal angles in a pentagon?

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?

Ihave trouble finding the nth term of a linear sequence

Could someone me with this question i’ve been stuck on it for 20 minutes