In mathematics, a rate is a ratio between two measurements with different units. If the unit or quantity in respect of which something is changing is not specified, usually the rate is per unit time.

Elvin Mirzayev, CFA, holds the CFO position at Norm OJSC. He has been a contributor to Investopedia since 2014. Samantha (Sam) Silberstein, CFP®, CSLP®, EA, is an experienced financial consultant. She ...

The Department of Mathematics and Statistics at Saint Louis University offers undergraduate options in pure mathematics, applied mathematics and statistics, as well as graduate degrees in mathematics.