Helping students 24/7 via screen casts

Students send me questions about math problems via email throughout the day.  It is not easy to demonstrate how to solve a math problem via email – especially when those problems involve exponents, subscripts, and square roots. It can be done, but it takes a lot of time.  If their question involves graphing, it is almost easier to wait until I see them in class.  But now I have a way to answer their questions quickly and easily.
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