Help me with this algaberic expressions with extolments

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?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Which of the following is the graph of y= square root -x-3