david powell

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2. Feature Requests and General Site Feedback

hi, I just completed the Precalculus unit on series. I'm pretty sure it contains no videos on convergence/divergence, so I'm surprised to find a Khan Academy video on this very topic on YouTube und...

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2. General Khan Academy Questions

Hi, I'm working through the calculus courses. If I have a questions or am stuck on something, which is the best sub-forum to post on? Study group? thanks.

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2. Study Group

hi, I'm currently working through the calculus courses. When I learned differentiation, I enjoyed calculating derivatives by using the slope formula. e.g. instead of just using the power rule to ca...

1. Community
2. Feature Requests and General Site Feedback

Hi, under "My courses" there is an option to "Add another course" I'm currently taking this calculus 1 course: https://www.khanacademy.org/math/calculus-1 When I click "Add another course" and choo...