This forum is for basic math questions relating to any sort of arithmetic, solving for x problems, 2-d graphing, logarithms and things like this.
If your question contains anything concerning limits, end behavior or basic function analysis put it in the Pre-Calc forum. If you question has anything to do with Calculus, meaning derivatives, integrals and all applications of these, put it in the Calculus forum. If your question is about anything other than basic matrix calculations, like adding, scalar multiplication and determinants of 2x2 matrices, it should go in the Linear Algebra forum.
These are some good examples but not completely comprehensive. Use your head when selecting the forum you make your thread in and it will get you help faster.