More examples finding vector angles ... https://www.youtube.com/watch?v=EX0Ha42WQ24 Note: All Khan Academy content is available for free at (www.khanacademy.org)

Multiplying any real or complex number by the imaginary unit j corresponds to a rotation. This is the key feature of j that makes it such a useful number. ... https://www.youtube.com/watch?v=giO5ACdU2LA Note: All Khan Academy content is available for free at (www.khanacademy.org)

This video walks you through the concepts covered on an AP Macroeconomics Free Response Question. AP(R) Macroeconomics on Khan Academy: Macroeconomics is all about how an entire nationÕs performance is determined and improved over time. Learn how factors like unemployment, inflation, interest rates, economic growth and recession are caused and how they affect individuals and society as a whole. We hit the traditional topics from an AP Macroeconomics course, including basic economic concepts, economic indicators, and the business cycle, national income and price determination, the financial sector, the long-run consequences of stabilization policies, and international trade and finance. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything https://www.youtube.com/subscription_center?add_user=khanacademy. View more lessons or practice this subject at http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/prepare-for-the-2018-ap-macro-exam/v/example-free-response-question-from-ap-macroeconomics-ap-macroeconomics-khan-academy?utm_source=youtube&utm_medium=desc&utm_campaign=apmacroeconomics AP Macroeconomics on Khan Academy: Welcome to Economics! In this lesson we'll define Economic and introduce some of the fundamental tools and perspectives economists use to understand the world around us! Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc ... https://www.youtube.com/watch?v=Qh8hO9j76R4 Note: All Khan Academy content is available for free at (www.khanacademy.org)

Thinking about how many ways you can pick four colors from a group of 6 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/precalculus/prob_comb/combinatorics_precalc/e/permutations_1?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus Watch the next lesson: https://www.khanacademy.org/math/precalculus/prob_comb/combinatorics_precalc/v/permutations-and-combinations-2?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus Missed the previous lesson? https://www.khanacademy.org/math/precalculus/prob_comb/combinatorics_precalc/v/zero-factorial-or-0?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus ... https://www.youtube.com/watch?v=oQpKtm5TtxU Note: All Khan Academy content is available for free at (www.khanacademy.org)