Please help But for real please help me!!

Multiplying an even number of negative numbers gives an answer that is choose from:

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.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15