What is the distance from the center of the hexagon to the midpoint of the side?

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?

Abcd is a parallelogram find the valuse of x

Icould really use some with this question.