Amuseum charges a school $200 to hold a trip + $2 entrance fee per person. the students must share the total cost of the trip equally include the entrance feee for 8 teachers. what is the function y(x) that gives that gives the cost per x person attending the trip?

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not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this