Help, please I need the answer

How do you find the circumfrance of a circle?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

Given a binomial distribution variable with n=20 and p=0.60 find the following possibilities using the binomial table a) p(x < 13) b) p x > 15) c) p(x = 17) d) p(11 < x < 14) e) p(11 < x < 14)