Which of the sets of ordered pairs represents a function?

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer