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What does it mean when the intervals of a function are increasing or decreasing? For example,w hat does it mean when it says a function is decreasing on the interval $(-\infty, 0)$ or for example or increasing on the interval $(0,-\infty)$?

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    We don't say that the intervals of a function are increasing/decreasing. We say that a function is increasing/decreasing over an interval. And it means that as you move to the right on the interval, the value of the function increases or decreases. So, if you think of a function just like an airplane that is moving in a time interval, if the airplane is increasing its latitude, it's like the function is increasing and when the airplane is decreasing its altitude, its like the function is decreasing.2013-12-04

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