Help me out here please

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.

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

What is the answer to the question 5x+2x