I dont need them all done I just need 2 or 3 done so I better understand it. you have to solve the problems using the quadratic formula​

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?