Practice this lesson yourself on KhanAcademy.org right now:

https://www.khanacademy.org/math/differential-calculus/derivative_applications/normal-tangent-line-eq/e/applications-of-derivatives–tangent-and-normal-lines?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialCalculus

Watch the next lesson: https://www.khanacademy.org/math/differential-calculus/derivative_applications/normal-tangent-line-eq/v/tangent-line-equation-example-1?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialCalculus

Missed the previous lesson?

https://www.khanacademy.org/math/differential-calculus/derivative_applications/normal-tangent-line-eq/v/tangent-line-intercept?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialCalculus

Differential calculus on Khan Academy: Limit introduction, squeeze theorem, and epsilon-delta definition of limits.

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