KA has an API, however, I'm not sure this is the same type of data you are looking for. If you are willing to develop a KA app, you could sample voluntarily-given data from users and sort by self-r...

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There are multiple existing resources to assist with this skill: Khan Academy ResourcesExponential function graph (method to plot a specific type of curve)https://www.khanacademy.org/math/algebra/i...

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3. I Want To Learn Plotting Curves.