Graph a function where interval (1) is a decreasing interval, interval (2) is an increasing interval, interval (3) is a constant interval, and interval (4) is an increasing interval.

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?