(-2)+1 can someone help me

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.

Which of the following expressions is equal to 2x^2+8

X2 + y 2 = 36 x + y = 6 solve the system of equations.