Please hurry

Describe what is happening in this graph with regards to the number of people in an amusement park on a summer day.
People

Ineed with 14, 16, 28 and 36 me. we didn't go over them in class so i don't know what to do.

Jessica is a custodian at oracle arena. she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate. at this rate how many sqaures meters can she wax per hour

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1