Ashark is at -80 feet. it swims up and jumps out of the water to a height of 15 feet. write a subtraction expression for the vertical distance the shark travels.

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?