Of what numbers does the binary system consist of

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

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.