A math-help site that answers the math problems you enter. Answers are shown as soon as you click "solve", and it also shows you HOW to get the answers.
Wolfram|Alpha's long-term goal is to make all systematic knowledge immediately computable and accessible to everyone.
We aim to collect and curate all objective data; implement every known model, method, and algorithm; and make it possible to compute whatever can be computed about anything. Our goal is to build on the achievements of science and other systematizations of knowledge to provide a single source that can be relied on by everyone for definitive answers to factual queries.