Is the number 19 prime or composite

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median amount spent? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Solve the triangle. a = 21°, c = 105°, c = 5