Which of the following examples has a unit rate of 25 feet per second? Select all that apply.
A) 100 feet in 4 seconds
B) 150 feet in 10 seconds
C) 225 feet in 9 seconds
D) 275 feet in 11 seconds
E) 100 feet in 5 seconds

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?