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bottom is what it is changing with respect to. Let's do an example. The following sentence is talking about a derivative: As time (t) passed, the person's height (h) changed. So now we will talk about what should the mathematical notation to represent this be. Since the quantity that is changing is h and it is doing so as time t passes The quantity that we are examining how it changes is on the top of the derivative. 1. As time (t) passed and more water was put into the bowl, the volume (V) of the liquid grew. Here Volume is growing sentence is discussing so its changing as time is passing, therefore this sen- dVdt 2. It takes more and more time (t) to move an object if it has more mass (m). 3. As many hours (h) passed, the temperature (t) of the meal got colder.

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