Please help! This is due soon but I’m stuck, This is about Exponents by the way.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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?

How can writing phrases as algebraic expressions you solve problems?