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Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Me. i can't figure out this question. give an explanation too. .

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?