Are the expressions 12a + (6+3a) and 3(5a + 2) equivalent show your work and explain

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.

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much