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Given the graph of a discrete function, Sal shows how to evaluate the function for a few different values.

Learn how to interpret expressions that contain a function within a real-world context. In this video, the function we interpret models an account balance over time.

A piecewise function is a function built from pieces of different functions over different intervals. For example, we can make a piecewise function f (x) where f (x) = -9 when -9 < x ≤ -5, f (x) = 6 …

So whenever you're asked whether something is a function of something else, you're really just saying, look, for any input x, does it map to exactly one y? So if we say y is a function of x, in …

When a function models a real-world context, we can learn a lot about the context from the function's graph. In this video, we interpret the y-intercept of a graph that models a basketball …

Say you have a function f (x) that takes in x and outputs y. f inverse of x would take in y and output x. This basically means the domain of one is the range of the other and vice versa.

Saying "f (x)" instead of "y" highlights the fact that you put a value for x into the function and get out a value for y. The function describes how y varies with x.

Mar 15, 2021 · What do Khan Academy’s interactive math worksheets cover? Our 100,000+ practice questions cover every math topic from arithmetic to calculus, as well as ELA, Science, …

So this point right over here, it helps you define the midline, the thing that you could imagine your sine or cosine function oscillates around, and then you also define a neighboring extreme …