HELLP ***
Which expression has a value of 15 when n= 7?
O 43-577
317-5
61-28
28
o
19-
17

Which of the following of the following sets of side lengths could not form a triangle?

Average acceleration: i have no idea how to do this.

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?