Find the gradients of lines A and B

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?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Can someone explain to me how to do