Cost/Revenue/Profit question help, please not only explain each function but the original equations and how to get values from the problem

OHaganBooks.com has recently decided to start selling music albums online through a service it calls o 'Tunes. Users pay a fee to download an entire music album. Composer royalties and copyright fees cost an average of S5.50 per album, and the cost of operating and maintaining o Tunes amounts to $500 per week. The company is currently charging customers $9.50 per album A) What are the associated (weekly) cost, C(x), revenue, R(r), and profit, P(x) functions, where x is the number of albums sold in a week? C(x) (Fill in) - R(x) Px) B) How many albums must be sold in a week to break even? SHOW WORK