The regular price of a CD is $15. What is the new price if there is a 20\% discount?

What are “like terms”? why can we only add like terms?

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.

Pls the last one and it has to be like number 6