I've seen lately a bunch of questions about derivatives. I think it's fairly obvious that derivatives are a topic that uses calculus, but maybe there is some confusion. Please do not post questions about derivatives, integrals, or anything else related to calculus in this forum. That belongs in the university forums, specifically the Calculus forum.
If you have a question about basic simplification, solving quadratic equations, graphing in the xy-plane, etc. it should go in the Algebra forum above this one. There is no concrete list of Pre-Calc concepts so there is overlap naturally, but as a general rule post here only if you are in a Pre-Calculus class or in a Calculus class reviewing, but haven't gotten to any Calculus concepts yet.
If any one else has noticed a common error where a certain topic is incorrectly being placed in this forum, please add on to this thread.