You buy a used car for $12,000. It depreciates at a rate of 15% per year. If this trend continues a) Write an exponential decay function that models the profit in dollars over time.
b) What is the value of the car after 1 year? Write only the number with no comma.
c) What is the value of the car after 5 years? Write only the number with no comma.

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?