I'm supposed to find the error in this problem

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.

If the value of cos330°is√3/2 then find cos 165°.

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?