12-(X+9) and 12-x-9*
A: Yes, they are equivalent
B: No, they're not equivalent

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.