Ask math and physics questions here and answer other people’s questions. I will also try to answer people’s questions on this discussion board. Just click “comments” on this page. Then click “ask a question or comment here” at the bottom of the next page to ask a question and click “reply” under someone else’s question to reply to their questions.
VectorCalc 
What is calculus used for?
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Calculus has many applications in physics and engineering. Especially in vector mechanics. It can be used to solve differential equations which come up a lot in physics.
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What is a quadratic equation?
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An equation of form ax^2+bx+c=0
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