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Algebra II on Khan Academy: Your studies in algebra 1 have built a solid foundation from which you can explore linear equations, inequalities, and functions. In algebra 2 we build upon that foundation and not only extend our knowledge of algebra 1, but slowly become capable of tackling the BIG questions of the universe. We'll again touch on systems of equations, inequalities, and functions...but we'll also address exponential and logarithmic functions, logarithms, imaginary and complex numbers, conic sections, and matrices. Don't let these big words intimidate you. We're on this journey with you!

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Find two numbers whose products is -16 and the sum of whose squares is a minimum.

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Hypothesis test for the difference between means of two populations.

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AP Statistics on Khan Academy: Meet one of our writers for AP¨_ Statistics, Jeff. A former high school teacher for 10 years in Kalamazoo, Michigan, Jeff taught Algebra 1, Geometry, Algebra 2, Introductory Statistics, and AP¨_ Statistics. Today he's hard at work creating new exercises and articles for AP¨_ Statistics.

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!

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Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

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.

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Improper integrals are definite integrals where one or both of the _bounderies is at infinity, or where the integrand has a vertical asymptote in the interval of integration. As crazy as it may sound, we can actually calculate some improper integrals using some clever methods that involve limits. Created by Sal Khan.

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AP Calculus BC on Khan Academy: Learn AP Calculus BC - everything from AP Calculus AB plus a few extra goodies, such as Taylor series, to prepare you for the AP Test

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.

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Learn the letter P with Ollo the Elephant from Khan Academy Kids!

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Learn the letter T with Ollo the Elephant from Khan Academy Kids!

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Learn the letter R with Ollo the Elephant from Khan Academy Kids!

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Today on Circle Time, we welcome Teacher Naomi and her son Noah to explain the topic of justice and fairness to children. Listen to Teacher Naomi’s story about fairness in her family, and how thinking of others can result in the best outcome for everyone. Read and play about fairness and taking turns with Caroline and Sophie. See drawings of Khan Kids characters. We love sharing your art!

This video is the third in a series that explains the values of diversity, race, and justice to young children. Our special guest, Naomi O’Brien, is a teacher, author, mother, and advocate for social justice. The series is aligned with the guidelines for anti-bias education from the National Association for the Education of Young Children. NAEYC curriculum goals include helping to develop a child’s positive personal identity, empathy towards others, and the awareness of fairness.⁣ Learn more about Naomi at https://readlikearockstarteaching.com/.

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Learn the letter H with Ollo the Elephant from Khan Academy Kids!

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The blue fruit is Peck's favorite food! The letters "u" and "e" team up to make the long /ū/ sound. The letters "u" and "i" team up to make the long /ū/ sound too. Learn about vowel teams with Reya the Red Panda from Khan Academy Kids.

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Get ready for a lively reading journey with us at Khan Academy Kids! We're excited to launch our new video series, Story Time. Together, we'll dive into captivating books, starting with "Starting School," an enchanting tale about Flamingo's first day of school.

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Sigurd had even ordered all of his men to put  severed heads of the men they had slain on their horses for the ride home to show the people how he had won a great victory and killed his enemies!  Unfortunately for Sigurd, he was about to suffer one of the strangest deaths in history!   

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Petardiers were special units of late medieval and early renaissance armies.
These explosive specialists were not engaged in open battles, but only during sieges where their skills were the most useful.

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Κρυπτεία
We hear how threats to national security are neutralized and traced through electronic media. Impressive technological advances have made it possible.
The need for this practice was always felt in ancient civilizations such as Ancient Greece.
The Spartans employed the same kinds of methods to help keep the population submissive.
This was done through the ‘Crypteia’, a type of secret police, in Sparta.

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Sources:
Campbell, Rodney. The Luciano Project: The Secret Wartime Collaboration of the Mafia and the U.S. Navy. McGraw-Hill, 1977.
Newark, Timothy. The Mafia at War: Allied Collusion with the Mob. Frontline, 2012.
Pantaleone, Michele. The Mafia and Politics. Chatto & Windus, 1966.
Lupo, Salvatore. History of the Mafia. Columbia University Press, 2009.
Lupo, Salvatore. The Two Mafias: A Transatlantic History, 1888-2008. Palgrave Macmillan, 2015.

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The Battle of Goose Green was the first land battle of the Falklands War.
Starting in the early hours of the 28th of May and ending the following day, the battle saw men from the British 2nd Battalion of the Parachute Regiment (2 PARA) against an enemy more than three times as numerous.


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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Dejan Milivojevic
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Sources:
Fremont-Barnes, Gregory. Goose Green 1982. Dundurn, 2016.
Anderson, Duncan. The Falklands War 1982. Osprey, 2002.
Fremont-Barnes, Gregory. A Companion to the Falklands War. History Press, 2017.
Upshon, Carl. "Battle of Goose Green - How 450 Men from 2 Para Defeated over 1200 Enemy Troops." Medium. July 18, 2017.
The Official History of the Falklands Campaign, Volume 2: War and Diplomacy (Government Official History Series) 28 Jun. 2005
by Lawrence Freedman

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War in general isn’t a pleasant place to be, however, it's quite clear that there are some jobs that are simply worse than others. While some soldiers may find themselves in unfortunate positions through direct orders of command, there are other roles that people have willingly volunteered for... and then discovered exactly why it was a terrible, terrible idea. Here are some jobs throughout military history you absolutely do NOT want to volunteer for.

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Teddy Roosevelt had no time to let a bullet to the chest ruin his speech..

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