There are 9 students in a class: 7 boys and 2 girls.

if the teacher picks a group of 3 at random, what is the probability that everyone in the group is a boy?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.