Solve the system of equations for -2x+2y=4

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.

If a || b and e || f , what if the value of y ?

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2