I need help with geometry i suck at it very bad

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

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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.