I've got a Mathematics assessment to complete and I'm stuck on a few questions, not really sure what to do. Should be easy for anyone good with Maths. The questions I'm stuck on, involve approximations, 1 to do with quadratics which I can't seem to be able to do, and functions which I don't really understand. If anyone feels like helping out, let me know. I will only PM the questions as I don't want them displayed publicly. PS. Not looking for an answer, but an explanation. Cheers.