Online courses directory (381)

Intro to Animation. Incrementing Shortcuts. If Statements.

Intro to Drawing. Challenge: H for Hopper. More Drawing!. Challenge: Simple Shapes!. Challenge: CRAZY Face. Intro to Coloring. Challenge: Ice Cream Code. Challenge: It's a Beautiful Day. Intro to Variables. Challenge: Bucktooth Bunny. More on Variables. Challenge: Funky Frog. Variable Expressions. Intro to Animation. Mouse Interaction. Incrementing Shortcuts. Using Math Expressions. Terrific Text: Part One. Terrific Text: Part Two.

If Statements. More Mouse Interaction. Booleans. If/Else - Part 1. If/Else - Part 2.

What is Programming?. Sneak Peek: Making An Awesome Program. A Tour of Programming on Khan Academy.

Conditional statements and deductive reasoning. Conditional statements exercise examples. Logical argument and deductive reasoning exercise example. Conditional statements and deductive reasoning. Conditional statements exercise examples. Logical argument and deductive reasoning exercise example.

Sal working through the 53 problems from the practice test available at http://www.cde.ca.gov/ta/tg/hs/documents/mathpractest.pdf for the CAHSEE (California High School Exit Examination). Clearly useful if you're looking to take that exam. Probably still useful if you want to make sure you have a solid understanding of basic high school math. CAHSEE Practice: Problems 1-3. CAHSEE Practice: Problems 4-9. CAHSEE Practice: Problems 10-12. CAHSEE Practice: Problems 13-14. CAHSEE Practice: Problems 15-16. CAHSEE Practice: Problems 17-19. CAHSEE Practice: Problems 20-22. CAHSEE Practice: Problems 23-27. CAHSEE Practice: Problems 28-31. CAHSEE Practice: Problems 32-34. CAHSEE Practice: Problems 35-37. CAHSEE Practice: Problems 38-42. CAHSEE Practice: Problems 43-46. CAHSEE Practice: Problems 47-51. CAHSEE Practice: Problems 52-53. CAHSEE Practice: Problems 1-3. CAHSEE Practice: Problems 4-9. CAHSEE Practice: Problems 10-12. CAHSEE Practice: Problems 13-14. CAHSEE Practice: Problems 15-16. CAHSEE Practice: Problems 17-19. CAHSEE Practice: Problems 20-22. CAHSEE Practice: Problems 23-27. CAHSEE Practice: Problems 28-31. CAHSEE Practice: Problems 32-34. CAHSEE Practice: Problems 35-37. CAHSEE Practice: Problems 38-42. CAHSEE Practice: Problems 43-46. CAHSEE Practice: Problems 47-51. CAHSEE Practice: Problems 52-53.

Sal works through problems in the 11th edition of the official GMAC GMAT Review (ISBN Number: 0-9765709-0-4 published in 2005). You should take the practice tests on your own, grade them and then use these videos to understand the problems you didn't get or to review. Have fun!. GMAT Math: 1. GMAT Math: 2. GMAT Math: 3. GMAT Math: 4. GMAT Math: 5. GMAT: Math 6. GMAT: Math 7. GMAT: Math 8. GMAT: Math 9. GMAT: Math 10. GMAT: Math 11. GMAT: Math 12. GMAT: Math 13. GMAT: Math 14. GMAT: Math 15. GMAT: Math 16. GMAT: Math 17. GMAT: Math 18. GMAT: Math 19. GMAT Math 20. GMAT Math 21. GMAT Math 22. GMAT Math 23. GMAT Math 24. GMAT Math 25. GMAT Math 26. GMAT Math 27. GMAT Math 28. GMAT Math 29. GMAT Math 30. GMAT Math 31. GMAT Math 32. GMAT Math 33. GMAT Math 34. GMAT Math 35. GMAT Math 36. GMAT Math 37. GMAT Math 38. GMAT Math 39. GMAT Math 40. GMAT Math 41. GMAT Math 42. GMAT Math 43. GMAT Math 44. GMAT Math 45. GMAT Math 46. GMAT Math 47. GMAT Math 48. GMAT Math 49. GMAT Math 50. GMAT Math 51. GMAT Math 52. GMAT Math 53. GMAT Math 54. GMAT: Data Sufficiency 1. GMAT: Data Sufficiency 2. GMAT: Data Sufficiency 3. GMAT: Data Sufficiency 4. GMAT: Data Sufficiency 5. GMAT: Data Sufficiency 6. GMAT: Data Sufficiency 7. GMAT: Data Sufficiency 8. GMAT: Data Sufficiency 9. GMAT: Data Sufficiency 10. GMAT: Data Sufficiency 11. GMAT: Data Sufficiency 12. GMAT: Data Sufficiency 13. GMAT: Data Sufficiency 14. GMAT: Data Sufficiency 15. GMAT: Data Sufficiency 16. GMAT: Data Sufficiency 17. GMAT: Data Sufficiency 18. GMAT: Data Sufficiency 19. GMAT: Data Sufficiency 20. GMAT: Data Sufficiency 21. GMAT Data Sufficiency 21 (correction). GMAT: Data Sufficiency 22. GMAT: Data Sufficiency 23. GMAT: Data Sufficiency 24. GMAT: Data Sufficiency 25. GMAT: Data Sufficiency 26. GMAT: Data Sufficiency 27. GMAT: Data Sufficiency 28. GMAT: Data Sufficiency 29. GMAT: Data Sufficiency 30. GMAT: Data Sufficiency 31. GMAT: Data Sufficiency 32. GMAT: Data Sufficiency 33. GMAT: Data Sufficiency 34. GMAT: Data Sufficiency 35. GMAT: Data Sufficiency 36. GMAT: Data Sufficiency 37. GMAT: Data Sufficiency 38. GMAT: Data Sufficiency 39. GMAT Data Sufficiency 40. GMAT Data Sufficiency 41. GMAT Math: 1. GMAT Math: 2. GMAT Math: 3. GMAT Math: 4. GMAT Math: 5. GMAT: Math 6. GMAT: Math 7. GMAT: Math 8. GMAT: Math 9. GMAT: Math 10. GMAT: Math 11. GMAT: Math 12. GMAT: Math 13. GMAT: Math 14. GMAT: Math 15. GMAT: Math 16. GMAT: Math 17. GMAT: Math 18. GMAT: Math 19. GMAT Math 20. GMAT Math 21. GMAT Math 22. GMAT Math 23. GMAT Math 24. GMAT Math 25. GMAT Math 26. GMAT Math 27. GMAT Math 28. GMAT Math 29. GMAT Math 30. GMAT Math 31. GMAT Math 32. GMAT Math 33. GMAT Math 34. GMAT Math 35. GMAT Math 36. GMAT Math 37. GMAT Math 38. GMAT Math 39. GMAT Math 40. GMAT Math 41. GMAT Math 42. GMAT Math 43. GMAT Math 44. GMAT Math 45. GMAT Math 46. GMAT Math 47. GMAT Math 48. GMAT Math 49. GMAT Math 50. GMAT Math 51. GMAT Math 52. GMAT Math 53. GMAT Math 54. GMAT: Data Sufficiency 1. GMAT: Data Sufficiency 2. GMAT: Data Sufficiency 3. GMAT: Data Sufficiency 4. GMAT: Data Sufficiency 5. GMAT: Data Sufficiency 6. GMAT: Data Sufficiency 7. GMAT: Data Sufficiency 8. GMAT: Data Sufficiency 9. GMAT: Data Sufficiency 10. GMAT: Data Sufficiency 11. GMAT: Data Sufficiency 12. GMAT: Data Sufficiency 13. GMAT: Data Sufficiency 14. GMAT: Data Sufficiency 15. GMAT: Data Sufficiency 16. GMAT: Data Sufficiency 17. GMAT: Data Sufficiency 18. GMAT: Data Sufficiency 19. GMAT: Data Sufficiency 20. GMAT: Data Sufficiency 21. GMAT Data Sufficiency 21 (correction). GMAT: Data Sufficiency 22. GMAT: Data Sufficiency 23. GMAT: Data Sufficiency 24. GMAT: Data Sufficiency 25. GMAT: Data Sufficiency 26. GMAT: Data Sufficiency 27. GMAT: Data Sufficiency 28. GMAT: Data Sufficiency 29. GMAT: Data Sufficiency 30. GMAT: Data Sufficiency 31. GMAT: Data Sufficiency 32. GMAT: Data Sufficiency 33. GMAT: Data Sufficiency 34. GMAT: Data Sufficiency 35. GMAT: Data Sufficiency 36. GMAT: Data Sufficiency 37. GMAT: Data Sufficiency 38. GMAT: Data Sufficiency 39. GMAT Data Sufficiency 40. GMAT Data Sufficiency 41.

SAT prep: test 1 section3 part 1. SAT Prep: Test 1 Section 3 Part 2. SAT Prep: Test 1 Section 3 Part 3. SAT Prep: Test 1 Section 3 Part 4. SAT Prep: Test 1 Section 3 Part 5. SAT Prep: Test 1 Section 3 Part 6. SAT Prep: Test 1 Section 3 Part 7. SAT Prep: Test 1 Section 3 Part 8. SAT Prep: Test 1 Section 6 Part 1. SAT Prep: Test 1 Section 6 Part 2. SAT Prep: Test 1 Section 6 Part 3. SAT Prep: Test 1 Section 6 Part 4. SAT Prep: Test 1 Section 6 Part 5. SAT Prep: Test 1 Section 6 Part 6. SAT Prep: Test 1 Section 9 Part 1. SAT Prep: Test 1 Section 9 Part 2. SAT Prep: Test 1 Section 9 Part 3. SAT Prep: Test 1 Section 9 Part 4. SAT Prep: Test 1 Section 9 Part 5. SAT Prep: Test 2 Section 3 part 1. SAT Prep: Test 2 Section 3 Part 2. SAT Prep: Test 2 Section 3 Part 3. SAT Prep: Test 2 Section 3 Part 4. SAT Prep: Test 2 Section 3 Part 5. SAT Prep: Test 2 Section 3 Part 6. SAT Prep: Test 2 Section 6 Part 1. SAT Prep: Test 2 Section 6 Part 2. SAT Prep: Test 2 Section 6 Part 3. SAT Prep: Test 2 Section 6 Part 4. SAT Prep: Test 2 Section 6 Part 5. SAT Prep: Test 2 Section 6 Part 6. SAT Prep: Test 2 Section 9 Part 1. SAT Prep: Test 2 Section 9 Part 2. SAT Prep: Test 2 Section 9 Part 3. SAT Prep: Test 2 Section 9 Part 4. SAT Prep: Test 3 Section 2 Part 1. SAT Prep: Test 3 Section 2 Part 2. SAT Prep: Test 3 Section 2 Part 3. SAT Prep: Test 3 Section 2 Part 4. Test 3 Section 2 Part 5. SAT Prep: Test 3 Section 4 Part 1. SAT Prep: Test 3 Section 4 Part 2. SAT Prep: Test 3 Section 4 Part 3. SAT Prep: Test 3 Section 4 Part 4. SAT Prep: Test 3 Section 4 Part 5. SAT Prep: Test 3 Section 8 Part 1. SAT Prep: Test 3 Section 8 Part 2. SAT Prep: Test 3 Section 8 Part 3. SAT Prep: Test 3 Section 8 Part 4. SAT Prep: Test 4 Section 2 Part 1. SAT Prep: Test 4 Section 2 Part 2. SAT Prep: Test 4 Section 2 Part 3. SAT Prep: Test 4 Section 2 Part 4. SAT Prep: Test 4 Section 2 Part 5. SAT Prep: Test 4 Section 2 Part 6. SAT Prep: Test 4 Section 4 Part 1. SAT Prep: Test 4 Section 4 Part 2. SAT Prep: Test 4 Section 4 Part 3. SAT Prep: Test 4 Section 4 Part 4. SAT Prep: Test 4 Section 8 Part 1. SAT Prep: Test 4 Section 8 Part 2. SAT Prep: Test 4 Section 8 Part 3. SAT Prep: Test 4 Section 8 Part 4. SAT Prep: Test 5 Section 3 Part 1. SAT Prep: Test 5 Section 3 Part 2. SAT Prep: Test 5 Section 3 Part 3. SAT Prep: Test 5 Section 3 Part 4. SAT Prep: Test 5 Section 3 Part 5. SAT Prep: Test 5 Section 3 Part 6. SAT Prep: Test 5 Section 7 Part 1. SAT Prep: Test 5 Section 7 Part 2. SAT Prep: Test 5 Section 7 Part 3. SAT Prep: Test 5 Section 7 Part 4. SAT Prep: Test 5 Section 7 Part 5. SAT Prep: Test 5 Section 7 Part 6. SAT Prep: Test 5 Section 9 Part 1. SAT Prep: Test 5 Section 9 Part 2. SAT Prep: Test 5 Section 9 Part 3. SAT Prep: Test 5 Section 9 Part 4. SAT Prep: Test 6 Section 3 Part 1. SAT Prep: Test 6 Section 3 Part 2. SAT Prep: Test 6 Section 3 Part 3. SAT Prep: Test 6 Section 3 Part 4. SAT Prep: Test 6 Section 3 Part 5. SAT Prep: Test 6 Section 7 Part 1. SAT Prep: Test 6 Section 7 Part 2. SAT Prep: Test 6 Section 7 Part 3. SAT Prep: Test 6 Section 7 Part 4. SAT Prep: Test 6 Section 7 Part 5. SAT Prep: Test 6 Section 7 Part 6. SAT Prep: Test 6 Section 9 Part 1. SAT Prep: Test 6 Section 9 Part 2. SAT Prep: Test 6 Section 9 Part 3. SAT Prep: Test 6 Section 9 Part 4. SAT Prep: Test 7 Section 2 Part 1. SAT Prep: Test 7 Section 2 Part 2. SAT Prep: Test 7 Section 2 Part 3. SAT Prep: Test 7 Section 2 Part 4. SAT Prep: Test 7 Section 5 Part 1. SAT Prep: Test 7 Section 5 Part 2. SAT Prep: Test 7 Section 5 Part 3. SAT Prep: Test 7 Section 5 Part 4. SAT Prep: Test 7 Section 5 Part 5. SAT Prep: Test 7 Section 8 Part 1. SAT Prep: Test 7 Section 8 Part 2. SAT Prep: Test 7 Section 8 Part 3. SAT Prep: Test 7 Section 8 Part 4. SAT Prep: Test 8 Section 2 Part 1. SAT Prep: Test 8 Section 2 Part 2. SAT Prep: Test 8 Section 2 Part 3. SAT Prep: Test 8 Section 2 Part 4. SAT Prep: Test 8 Section 5 Part 1. SAT Prep: Test 8 Section 5 Part 2. SAT Prep: Test 8 Section 5 Part 3. SAT Prep: Test 8 Section 5 Part 4. SAT Prep: Test 8 Section 8 Part 1. SAT Prep: Test 8 Section 8 Part 2. SAT Prep: Test 8 Section 8 Part 3. SAT prep: test 1 section3 part 1. SAT Prep: Test 1 Section 3 Part 2. SAT Prep: Test 1 Section 3 Part 3. SAT Prep: Test 1 Section 3 Part 4. SAT Prep: Test 1 Section 3 Part 5. SAT Prep: Test 1 Section 3 Part 6. SAT Prep: Test 1 Section 3 Part 7. SAT Prep: Test 1 Section 3 Part 8. SAT Prep: Test 1 Section 6 Part 1. SAT Prep: Test 1 Section 6 Part 2. SAT Prep: Test 1 Section 6 Part 3. SAT Prep: Test 1 Section 6 Part 4. SAT Prep: Test 1 Section 6 Part 5. SAT Prep: Test 1 Section 6 Part 6. SAT Prep: Test 1 Section 9 Part 1. SAT Prep: Test 1 Section 9 Part 2. SAT Prep: Test 1 Section 9 Part 3. SAT Prep: Test 1 Section 9 Part 4. SAT Prep: Test 1 Section 9 Part 5. SAT Prep: Test 2 Section 3 part 1. SAT Prep: Test 2 Section 3 Part 2. SAT Prep: Test 2 Section 3 Part 3. SAT Prep: Test 2 Section 3 Part 4. SAT Prep: Test 2 Section 3 Part 5. SAT Prep: Test 2 Section 3 Part 6. SAT Prep: Test 2 Section 6 Part 1. SAT Prep: Test 2 Section 6 Part 2. SAT Prep: Test 2 Section 6 Part 3. SAT Prep: Test 2 Section 6 Part 4. SAT Prep: Test 2 Section 6 Part 5. SAT Prep: Test 2 Section 6 Part 6. SAT Prep: Test 2 Section 9 Part 1. SAT Prep: Test 2 Section 9 Part 2. SAT Prep: Test 2 Section 9 Part 3. SAT Prep: Test 2 Section 9 Part 4. SAT Prep: Test 3 Section 2 Part 1. SAT Prep: Test 3 Section 2 Part 2. SAT Prep: Test 3 Section 2 Part 3. SAT Prep: Test 3 Section 2 Part 4. Test 3 Section 2 Part 5. SAT Prep: Test 3 Section 4 Part 1. SAT Prep: Test 3 Section 4 Part 2. SAT Prep: Test 3 Section 4 Part 3. SAT Prep: Test 3 Section 4 Part 4. SAT Prep: Test 3 Section 4 Part 5. SAT Prep: Test 3 Section 8 Part 1. SAT Prep: Test 3 Section 8 Part 2. SAT Prep: Test 3 Section 8 Part 3. SAT Prep: Test 3 Section 8 Part 4. SAT Prep: Test 4 Section 2 Part 1. SAT Prep: Test 4 Section 2 Part 2. SAT Prep: Test 4 Section 2 Part 3. SAT Prep: Test 4 Section 2 Part 4. SAT Prep: Test 4 Section 2 Part 5. SAT Prep: Test 4 Section 2 Part 6. SAT Prep: Test 4 Section 4 Part 1. SAT Prep: Test 4 Section 4 Part 2. SAT Prep: Test 4 Section 4 Part 3. SAT Prep: Test 4 Section 4 Part 4. SAT Prep: Test 4 Section 8 Part 1. SAT Prep: Test 4 Section 8 Part 2. SAT Prep: Test 4 Section 8 Part 3. SAT Prep: Test 4 Section 8 Part 4. SAT Prep: Test 5 Section 3 Part 1. SAT Prep: Test 5 Section 3 Part 2. SAT Prep: Test 5 Section 3 Part 3. SAT Prep: Test 5 Section 3 Part 4. SAT Prep: Test 5 Section 3 Part 5. SAT Prep: Test 5 Section 3 Part 6. SAT Prep: Test 5 Section 7 Part 1. SAT Prep: Test 5 Section 7 Part 2. SAT Prep: Test 5 Section 7 Part 3. SAT Prep: Test 5 Section 7 Part 4. SAT Prep: Test 5 Section 7 Part 5. SAT Prep: Test 5 Section 7 Part 6. SAT Prep: Test 5 Section 9 Part 1. SAT Prep: Test 5 Section 9 Part 2. SAT Prep: Test 5 Section 9 Part 3. SAT Prep: Test 5 Section 9 Part 4. SAT Prep: Test 6 Section 3 Part 1. SAT Prep: Test 6 Section 3 Part 2. SAT Prep: Test 6 Section 3 Part 3. SAT Prep: Test 6 Section 3 Part 4. SAT Prep: Test 6 Section 3 Part 5. SAT Prep: Test 6 Section 7 Part 1. SAT Prep: Test 6 Section 7 Part 2. SAT Prep: Test 6 Section 7 Part 3. SAT Prep: Test 6 Section 7 Part 4. SAT Prep: Test 6 Section 7 Part 5. SAT Prep: Test 6 Section 7 Part 6. SAT Prep: Test 6 Section 9 Part 1. SAT Prep: Test 6 Section 9 Part 2. SAT Prep: Test 6 Section 9 Part 3. SAT Prep: Test 6 Section 9 Part 4. SAT Prep: Test 7 Section 2 Part 1. SAT Prep: Test 7 Section 2 Part 2. SAT Prep: Test 7 Section 2 Part 3. SAT Prep: Test 7 Section 2 Part 4. SAT Prep: Test 7 Section 5 Part 1. SAT Prep: Test 7 Section 5 Part 2. SAT Prep: Test 7 Section 5 Part 3. SAT Prep: Test 7 Section 5 Part 4. SAT Prep: Test 7 Section 5 Part 5. SAT Prep: Test 7 Section 8 Part 1. SAT Prep: Test 7 Section 8 Part 2. SAT Prep: Test 7 Section 8 Part 3. SAT Prep: Test 7 Section 8 Part 4. SAT Prep: Test 8 Section 2 Part 1. SAT Prep: Test 8 Section 2 Part 2. SAT Prep: Test 8 Section 2 Part 3. SAT Prep: Test 8 Section 2 Part 4. SAT Prep: Test 8 Section 5 Part 1. SAT Prep: Test 8 Section 5 Part 2. SAT Prep: Test 8 Section 5 Part 3. SAT Prep: Test 8 Section 5 Part 4. SAT Prep: Test 8 Section 8 Part 1. SAT Prep: Test 8 Section 8 Part 2. SAT Prep: Test 8 Section 8 Part 3.

Hank Green teaches you ecology!. The History of Life on Earth. Population Ecology: The Texas Mosquito Mystery. Human Population Growth. Community Ecology: Feel the Love. Community Ecology II: Predators. Ecological Succession: Change is Good. Ecosystem Ecology: Links in the Chain. The Hydrologic and Carbon Cycles: Always Recycle!. Nitrogen and Phosphorus Cycles: Always Recycle!. 5 Human Impacts on the Environment. Pollution. Conservation and Restoration Ecology. The History of Life on Earth. Population Ecology: The Texas Mosquito Mystery. Human Population Growth. Community Ecology: Feel the Love. Community Ecology II: Predators. Ecological Succession: Change is Good. Ecosystem Ecology: Links in the Chain. The Hydrologic and Carbon Cycles: Always Recycle!. Nitrogen and Phosphorus Cycles: Always Recycle!. 5 Human Impacts on the Environment. Pollution. Conservation and Restoration Ecology.

Hank Green teaches you biology!. Why Carbon is a Tramp. Water - Liquid Awesome. Biological Molecules - You Are What You Eat. Eukaryopolis - The City of Animal Cells. In Da Club - Membranes & Transport. Plant Cells. ATP & Respiration. Photosynthesis. Heredity. DNA Structure and Replication. DNA, Hot Pockets, & The Longest Word Ever. Mitosis: Splitting Up is Complicated. Meiosis: Where the Sex Starts. Natural Selection. Speciation: Of Ligers & Men. Animal Development: We're Just Tubes. Evolutionary Development: Chicken Teeth. Population Genetics: When Darwin Met Mendel. Taxonomy: Life's Filing System. Evolution: It's a Thing. Comparative Anatomy: What Makes Us Animals. Simple Animals: Sponges, Jellies, & Octopuses. Complex Animals: Annelids & Arthropods. Chordates. Animal Behavior. The Nervous System. Circulatory & Respiratory Systems. The Digestive System. The Excretory System: From Your Heart to the Toilet. The Skeletal System: It's ALIVE!. Big Guns: The Muscular System. Your Immune System: Natural Born Killer. Great Glands - Your Endocrine System. The Reproductive System: How Gonads Go. Old & Odd: Archaea, Bacteria & Protists. The Sex Lives of Nonvascular Plants. Vascular Plants = Winning!. The Plants & The Bees: Plant Reproduction. Fungi: Death Becomes Them. Ecology - Rules for Living on Earth. Why Carbon is a Tramp. Water - Liquid Awesome. Biological Molecules - You Are What You Eat. Eukaryopolis - The City of Animal Cells. In Da Club - Membranes & Transport. Plant Cells. ATP & Respiration. Photosynthesis. Heredity. DNA Structure and Replication. DNA, Hot Pockets, & The Longest Word Ever. Mitosis: Splitting Up is Complicated. Meiosis: Where the Sex Starts. Natural Selection. Speciation: Of Ligers & Men. Animal Development: We're Just Tubes. Evolutionary Development: Chicken Teeth. Population Genetics: When Darwin Met Mendel. Taxonomy: Life's Filing System. Evolution: It's a Thing. Comparative Anatomy: What Makes Us Animals. Simple Animals: Sponges, Jellies, & Octopuses. Complex Animals: Annelids & Arthropods. Chordates. Animal Behavior. The Nervous System. Circulatory & Respiratory Systems. The Digestive System. The Excretory System: From Your Heart to the Toilet. The Skeletal System: It's ALIVE!. Big Guns: The Muscular System. Your Immune System: Natural Born Killer. Great Glands - Your Endocrine System. The Reproductive System: How Gonads Go. Old & Odd: Archaea, Bacteria & Protists. The Sex Lives of Nonvascular Plants. Vascular Plants = Winning!. The Plants & The Bees: Plant Reproduction. Fungi: Death Becomes Them. Ecology - Rules for Living on Earth.

John Green teaches you the history of the world in 42 episodes of Crash Course. The Agricultural Revolution. Indus Valley Civilization. Ancient Mesopotamia. Ancient Egypt. Greeks and Persians. Buddha and Ashoka. 2000 Years of Chinese History! The Mandate of Heaven and Confuscius. Alexander the Great and the Situation... the Great?. The Silk Road and Ancient Trade. The Roman Empire. Or Republic. Or... Which Was It?. Christianity from Judaism to Constantine. Fall of Rome the Roman Empire... in the 15th Century. Islam, the Quran, and the Five Pillars All Without a Flamewar. The Dark Ages...How Dark Were They, Really?. The Crusades - Pilgrimage or Holy War?. Mansa Musa and Islam in Africa. Wait for it... The Mongols!. International Commerce, Snorkeling Camels, and The Indian Ocean Trade. Venice and the Ottoman Empire. Russia, the Kievan Rus, and the Mongols. Columbus, de Gama, and Zheng He! 15th Century Mariners. The Renaissance: Was it a Thing?. The Columbian Exchange. The Atlantic Slave Trade. The Spanish Empire, Silver, & Runaway Inflation. The Seven Years War. The Amazing Life and Strange Death of Captain Cook. Tea, Taxes, and The American Revolution. The French Revolution. The Haitian Revolutions. Latin American Revolutions. Coal, Steam, and The Industrial Revolution. Capitalism and Socialism. Samurai, Daimyo, Matthew Perry, and Nationalism. Imperialism. Archdukes, Cynicism, and World War I. Communists, Nationalists, and China's Revolutions. World War II. USA vs USSR Fight! The Cold War. Decolonization and Nationalism Triumphant. Globalization I - The Upside. Globalization II - Good or Bad?. The Agricultural Revolution. Indus Valley Civilization. Ancient Mesopotamia. Ancient Egypt. Greeks and Persians. Buddha and Ashoka. 2000 Years of Chinese History! The Mandate of Heaven and Confuscius. Alexander the Great and the Situation... the Great?. The Silk Road and Ancient Trade. The Roman Empire. Or Republic. Or... Which Was It?. Christianity from Judaism to Constantine. Fall of Rome the Roman Empire... in the 15th Century. Islam, the Quran, and the Five Pillars All Without a Flamewar. The Dark Ages...How Dark Were They, Really?. The Crusades - Pilgrimage or Holy War?. Mansa Musa and Islam in Africa. Wait for it... The Mongols!. International Commerce, Snorkeling Camels, and The Indian Ocean Trade. Venice and the Ottoman Empire. Russia, the Kievan Rus, and the Mongols. Columbus, de Gama, and Zheng He! 15th Century Mariners. The Renaissance: Was it a Thing?. The Columbian Exchange. The Atlantic Slave Trade. The Spanish Empire, Silver, & Runaway Inflation. The Seven Years War. The Amazing Life and Strange Death of Captain Cook. Tea, Taxes, and The American Revolution. The French Revolution. The Haitian Revolutions. Latin American Revolutions. Coal, Steam, and The Industrial Revolution. Capitalism and Socialism. Samurai, Daimyo, Matthew Perry, and Nationalism. Imperialism. Archdukes, Cynicism, and World War I. Communists, Nationalists, and China's Revolutions. World War II. USA vs USSR Fight! The Cold War. Decolonization and Nationalism Triumphant. Globalization I - The Upside. Globalization II - Good or Bad?.

2003 AIME II Problem 1. 2003 AIME II Problem 3. Sum of factors of 27000. Sum of factors 2. 2003 AIME II Problem 4 (part 1). 2003 AIME II Problem 4 (part 2). 2003 AIME II Problem 5. 2003 AIME II Problem 5 Minor Correction. Area Circumradius Formula Proof. 2003 AIME II Problem 6. 2003 AIME II Problem 7. 2003 AIME II Problem 8. Sum of Polynomial Roots (Proof). Sum of Squares of Polynomial Roots. 2003 AIME II Problem 9. 2003 AIME II Problem 10. 2003 AIME II Problem 11. 2003 AIME II Problem 12. 2003 AIME II Problem 13. 2003 AIME II Problem 14. 2003 AIME II Problem 15 (part 1). 2003 AIME II Problem 15 (part 2). 2003 AIME II Problem 15 (part 3). 2003 AIME II Problem 1. 2003 AIME II Problem 3. Sum of factors of 27000. Sum of factors 2. 2003 AIME II Problem 4 (part 1). 2003 AIME II Problem 4 (part 2). 2003 AIME II Problem 5. 2003 AIME II Problem 5 Minor Correction. Area Circumradius Formula Proof. 2003 AIME II Problem 6. 2003 AIME II Problem 7. 2003 AIME II Problem 8. Sum of Polynomial Roots (Proof). Sum of Squares of Polynomial Roots. 2003 AIME II Problem 9. 2003 AIME II Problem 10. 2003 AIME II Problem 11. 2003 AIME II Problem 12. 2003 AIME II Problem 13. 2003 AIME II Problem 14. 2003 AIME II Problem 15 (part 1). 2003 AIME II Problem 15 (part 2). 2003 AIME II Problem 15 (part 3).

The AMC 10 is part of the series of contests administered by the MAA American Mathematics Competitions that determines the United States team in the International Math Olympiad. The AMC 10 is a 25 question, 75 minute multiple choice test for students in 10th grade or below. Two versions of the AMC 10 are offered each year. 2013 AMC 10 A #21 / AMC 12 A #17. 2013 AMC 10 A #22 / AMC 12 A #18. 2013 AMC 10 A #23 / AMC 12 A #19. 2013 AMC 10 A #24. 2013 AMC 10 A #25. 2013 AMC 10 A #21 / AMC 12 A #17. 2013 AMC 10 A #22 / AMC 12 A #18. 2013 AMC 10 A #23 / AMC 12 A #19. 2013 AMC 10 A #24. 2013 AMC 10 A #25.

What ratios and proportions are. Using them to solve problems in the real world. Ratio problem with basic algebra (new HD). Writing proportions. Writing proportions. Find an Unknown in a Proportion. Find an Unknown in a Proportion 2. Proportions 1. Proportions 2 exercise examples. Proportions 2. Constructing proportions to solve application problems. Constructing proportions to solve application problems. The Golden Ratio. Advanced ratio problems. More advanced ratio problem--with Algebra (HD version). Another Take on the Rate Problem. Alternate Solution to Ratio Problem (HD Version). Mountain height word problem. Ratio problem with basic algebra (new HD). Writing proportions. Writing proportions. Find an Unknown in a Proportion. Find an Unknown in a Proportion 2. Proportions 1. Proportions 2 exercise examples. Proportions 2. Constructing proportions to solve application problems. Constructing proportions to solve application problems. The Golden Ratio. Advanced ratio problems. More advanced ratio problem--with Algebra (HD version). Another Take on the Rate Problem. Alternate Solution to Ratio Problem (HD Version). Mountain height word problem.

Learn to tell time with some fun exercises!. Telling time exercise example 1. Telling time exercise example 2. Telling time exercise example 1. Telling time exercise example 2.

Learn how a mother is able to nourish a baby through breastfeeding. Breast Anatomy. Breastfeeding - Letdown Reflex. Breast Anatomy. Breastfeeding - Letdown Reflex.

Learn how asthma causes breathing difficulties in adults and children. Breathing Basics. Asthma. Breathing Basics. Asthma.

Find out what helps you grow and how we can measure growth. Basics of Metabolism. Digesting Food. Growth Curves. Cycle of Malnutrition. Basics of Metabolism. Digesting Food. Growth Curves. Cycle of Malnutrition.

Learn about influenza symptoms, diagnosis, and treatment. Most of all, get all of your questions answered about the flu vaccine!. Flu Symptoms and Diagnosis. Flu Epidemiology. Flu Pathophysiology. Genetic Shift and Drift. 2 Types of Flu Vaccine. Flu Vaccine Risks and Benefits. Flu Vaccine Excuses. Flu Symptoms and Diagnosis. Flu Epidemiology. Flu Pathophysiology. Genetic Shift and Drift. 2 Types of Flu Vaccine. Flu Vaccine Risks and Benefits. Flu Vaccine Excuses.