7. Which expression is equivalent to 3-4.3^6?

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?

If anyone has done the algebra 2 chaos theory portfolio would you be wiling to me? i kind of know what i'm doing i just don't know if i'm doing it right.

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3