The garzas choose carpeting that cost $18.70 per square yard. they need 11.5 square yards for one room and 15.2 square yards for another. how much will the garzas was spend to carpet the two rooms?

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?