Following is a list of bank transactions Tiana made this month. The variable, b, represents her initial balance. Deposit $275.
Withdraw $18b.
Withdraw $14b.
Deposit $320.
Which expression represents the change in her account balance this month?

−595+38b
595+38b
−595+(−38b)
595+(−38b)

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?