Help plz ill give brainless

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.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.