Find the probability of not rolling the difference of 1 with two dice

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.

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

50 points~ ! i have to turn this in tomarrow