67-69, binomial expansions and the sum of a geometric series ... https://www.youtube.com/watch?v=EwKWzFv3Ul8 Note: All Khan Academy content is available for free at (www.khanacademy.org)

Watch as we use a nifty interactive module to demonstrate how moving points along a number line can help us find the mean and median. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/probability/descriptive-statistics/central_tendency/e/exploring_mean_and_median?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Watch the next lesson: https://www.khanacademy.org/math/probability/descriptive-statistics/central_tendency/v/comparing-distribution-means?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Missed the previous lesson? https://www.khanacademy.org/math/probability/descriptive-statistics/central_tendency/v/mean-median-and-mode?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics ... https://www.youtube.com/watch?v=n6xCyzOP900 Note: All Khan Academy content is available for free at (www.khanacademy.org)

Finding the appropriate expression to use when looking for the position at a certain time. Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-applications-definite-integrals/ab-motion-integrals/v/analyzing-motion-problems-total-dist-traveled?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-applications-definite-integrals/ab-motion-integrals/v/motion-problems-with-integrals?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover, Massachusetts, and heÕs part of the teaching team that helped develop Khan AcademyÕs AP lessons. Phillips Academy was one of the first schools to teach AP nearly 60 years ago. About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. ... https://www.youtube.com/watch?v=M7IZClYqdEo Note: All Khan Academy content is available for free at (www.khanacademy.org)

Another example of using http://www.khanacademy.org/math/geometry/triangles/e/geometry_proofs_intro ... https://www.youtube.com/watch?v=NDeDnfuoDQM Note: All Khan Academy content is available for free at (www.khanacademy.org)