Will someone help me with this problem plz

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 system of equations y= 3/2 - 1, -x+ y =-3

2.5 milligrams is equivalent to how many grams