1. The problem statement, all variables and given/known data I first posted this in the pre-calculus section, then the guy who first came up with the formula hinted at integration, so I guess it's meant to be in the calculus section 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: 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!