1. The problem statement, all variables and given/known data Now this isn't a homework question, it's something me and some others are looking into, and someone posted this function, and I'm not sure how he worked it out: Creating a function for Elvis' album sales based on the RIAA certifications of his albums that have been certified so far So what he's done is used the figures from the albums certified to create an equation. So therefore if you substitute 1 for x in the function, which is actually equal to 500,000 you will get all the albums that certified for over 500,000 sales, it's not exact, but it's a close enough function, how did he work that function out? 2. Relevant equations None 3. The attempt at a solution I have no idea!