Pls hurry I’m being timed

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row