How many trees are in the field

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.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Factor and solve to find roots x squared -x - 90 =0