Marquetta sells hand-knit sweaters at a handicrafts market. Each sweater sells for $50. The wool costs Marquetta $30 per sweater and there is a booth fee of $25. How many sweaters must she sell to make a profit?

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?