What is 20 minus 2 equal?

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.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

Prove that 16^4-2^13-4^5 is divisible by 11.