Assuming that you attend school 180 days a year for 8 hours a day from first through twelfth grade, you'd be in class for a total of 2160 school days. how many total years of your life will you have spent in school by the time you graduate? (you have to use dimensional analysis)

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?