A 27 gram sample of a substance that's used to treat thyroid disorders has a k value of 0.1013 . N=N 0 e^ -kt N 0 = initial mass (at time t=0) N = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time , in days

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?