Distribute 3x(4x-2) please 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?

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Measures of the angle of r, 31 s (x+4) t (3x+9)