Someone help me find the account toomanypoggers

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Find the domain and range of the following function f(x) = 51x - 21+ 4

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?