Admission to a science museum is $22 for an adult the cost of a child is five dollars less than the cost for an adult what would be the total cost of admission for 12 adults and 15 children explain

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?