Top videos

Solving the matrix vector equation | Matrices | Precalculus | Khan Academy
Solving the matrix vector equation | Matrices | Precalculus | Khan Academy Teacherflix 68 Views • 2 years ago

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/precalculus/precalc-matrices/matrix-equations/e/writing-systems-of-equations-as-matrix-equations?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Watch the next lesson: https://www.khanacademy.org/math/precalculus/precalc-matrices/reduced_row_echelon/v/matrices-reduced-row-echelon-form-1?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Missed the previous lesson?
https://www.khanacademy.org/math/precalculus/precalc-matrices/matrix-equations/v/matrix-equations-systems?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn't mean anything unless you have some knowledge of what calculus is. Let's keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore....precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen....an introduction to precalculus!

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

Subscribe to Khan Academy’s Precalculus channel:
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Kirchhoff's Law, Junction & Loop Rule, Ohm's Law - KCl & KVl Circuit Analysis - Ph
Kirchhoff's Law, Junction & Loop Rule, Ohm's Law - KCl & KVl Circuit Analysis - Ph Teacherflix 61 Views • 2 years ago

This physics video tutorial explains how to solve complex DC circuits using kirchoff's law. Kirchoff's current law or junction rule states that the total current entering a junction is equal to the total current leaving the junction. Kirchoff's voltage law or loop rule states that the sum of all the voltages around a loop must add to zero. You need to be able to distinguish a voltage drop from a voltage lift. In addition, you need to be familiar with ohm's law when dealing with loop rule using kirchoff's law. This video contains plenty of examples and practice problems on KCl & KVl circuit analysis.

Schematic Diagrams & Symbols:
https://www.youtube.com/watch?v=Dl1gFBNa0Ik

Resistors In Series:
https://www.youtube.com/watch?v=9z53qVQjasU

Resistors In Parallel:
https://www.youtube.com/watch?v=SYrOiQs3X2U

Series and Parallel Circuits - Light Bulb Brightness:
https://www.youtube.com/watch?v=NjgxXcBfIII

Equivalent Resistance of Complex Circuits:
https://www.youtube.com/watch?v=kjW4H3fKi8o

How To Solve DC Circuits:
https://www.youtube.com/watch?v=eFlJy0cPbsY

_________________________
Voltage Divider Circuit:
https://www.youtube.com/watch?v=JGXdi7XcQi8

Current Dividers:
https://www.youtube.com/watch?v=PpfOH_uBKCw

Parallel Circuit Challenge Problem:
https://www.youtube.com/watch?v=y-gwr8LCHKo

Kirchhoff's Current Law:
https://www.youtube.com/watch?v=Q39xQUlTGew

Kirchhoff's Voltage Law:
https://www.youtube.com/watch?v=6F_rmZ1nXFQ

DC Circuits Review:
https://www.youtube.com/watch?v=wejz5s31Cts

____________________________
Thevenin's Theorem - Circuit Analysis:
https://www.youtube.com/watch?v=zTDgziJC-q8

Norton's Theorem - Circuit Analysis:
https://www.youtube.com/watch?v=-kkvqr1wSwA

Superposition Theorem:
https://www.youtube.com/watch?v=EX52BuZxpQM

Maximum Power Transfer:
https://www.youtube.com/watch?v=8CA6ZNXgI-Y

Physics PDF Worksheets:
https://www.video-tutor.net/ph....ysics-basic-introduc

Hoplite - Citizen soldier (Ancient Greece)
Hoplite - Citizen soldier (Ancient Greece) Teacherflix 50 Views • 2 years ago

Greek Hoplites were heavy infantry soldiers, citizen-soldiers who equipped themselves when called to fight for the poleis or city-state.

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Credit:
Created by Daniel Turner

Narrator:

Chris Kane
https://vocalforge.com/

Music Credit:
Hero's Theme by Twin Musicom is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://www.twinmusicom.org/song/280/heros-theme
Artist: http://www.twinmusicom.org

Firesong by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/r....oyalty-free/index.ht
Artist: http://incompetech.com/

Sources:

Greek Hoplite vs Persian Warrior: 499–479 BC
By Chris McNab

Historical Dictionary of Ancient Greek Warfare
By Iain Spence

Spartan Warrior 735–331 BC
By Duncan B Campbell

Athenian Democracy at War
By David M. Pritchard

The Hutchinson Dictionary of Ancient and Medieval Warfare
edited by Peter Connolly, John Gillingham, John Lazenby

Indefinite Pronouns
Indefinite Pronouns Teacherflix 45 Views • 2 years ago

Follow along with Ashely and Mia as they teach you about indefinite pronouns.

We hope you are enjoying this video! For more in-depth learning, check out Miacademy.co (
https://www.parents.miacademy.co/), an online learning platform with lessons and practice games that go along with our videos. Use coupon code VIDEOSPECIAL for a discount. Good for homeschoolers, Parents, Teachers, or anyone with kids in grades K-8.

Miacademy also offers many hands-on learning activities including a business simulation, writing in the Miacademy weekly, and creating artwork. Teaching social skills is also one of the key values at Miacademy. On the site, kids can interact safely in a moderated environment and share their artwork, videos, and ideas with each other.

Divergence theorem example 1 | Divergence theorem | Multivariable Calculus | Khan Academy
Divergence theorem example 1 | Divergence theorem | Multivariable Calculus | Khan Academy Teacherflix 48 Views • 2 years ago

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/multivariable-cal

Example of calculating the flux across a surface by using the Divergence Theorem

Watch the next lesson: https://www.khanacademy.org/math/multivariable-calculus/divergence_theorem_topic/divergence_theorem/v/why-we-got-zero-flux-in-divergence-theorem-example-1?utm_source=YT&utm_medium=Desc&utm_campaign=MultivariableCalculus

Missed the previous lesson?
https://www.khanacademy.org/math/multivariable-calculus/divergence_theorem_topic/divergence_theorem/v/3-d-divergence-theorem-intuition?utm_source=YT&utm_medium=Desc&utm_campaign=MultivariableCalculus

Multivariable Calculus on Khan Academy: Think calculus. Then think algebra II and working with two variables in a single equation. Now generalize and combine these two mathematical concepts, and you begin to see some of what Multivariable calculus entails, only now include multi dimensional thinking. Typical concepts or operations may include: limits and continuity, partial differentiation, multiple integration, scalar functions, and fundamental theorem of calculus in multiple dimensions.

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

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Electric Dipole Moment, Force, Torque, Potential Energy, Work, Electric Field, Physics
Electric Dipole Moment, Force, Torque, Potential Energy, Work, Electric Field, Physics Teacherflix 45 Views • 2 years ago

This physics video tutorial explains how to calculate the magnitude of the electric dipole moment and its direction. An electric dipole is simply the combination of a positive charge and a negative charge that have the same magnitude but opposite signs. This video shows you how to calculate the forces exerted on a dipole, the rotational torque acting on it, the potential energy due to its rotation in an electric field, and the work required to rotate it from one angular position to another. This video involves some knowledge of calculus and integration of trigonometric functions such as sine and cosine. This video contains a few practice problems and examples.

Physics 2 - Basic Introduction:
https://www.youtube.com/watch?v=rHgKLIYcZOI

Electric Charge - Physics:
https://www.youtube.com/watch?v=VD009jiZreo

Conservation of Electric Charge:
https://www.youtube.com/watch?v=OSUvXC1pACA

Coulomb's Law and Electric Force:
https://www.youtube.com/watch?v=kCp5yYjo9zE

Electric Fields:
https://www.youtube.com/watch?v=V9RLc9EX1so

________________________
Electric Flux:
https://www.youtube.com/watch?v=q1eor6oIuUo

Gauss Law Problems:
https://www.youtube.com/watch?v=IS1hyHBh3QQ

Electric Potential:
https://www.youtube.com/watch?v=LzKMQByFSLc

Equipotential Lines:
https://www.youtube.com/watch?v=j_Cy891cmIY

_______________________
The Electron Volt:
https://www.youtube.com/watch?v=DjQl4J-jePc

Electric Potential Energy:
https://www.youtube.com/watch?v=KoZ61FujkRk

Physics PDF Worksheets:
https://www.video-tutor.net/ph....ysics-basic-introduc

WWI Factions: The German Army
WWI Factions: The German Army Teacherflix 19 Views • 2 years ago

Faction: The German Army

The First World War

Germany was recognised as having the most efficient army in the world. It utilized mass conscription for short-term military service followed by a longer period in reserves.

Emphasis was placed on high quality training while maintaining a high number of experienced senior officers.


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Narrator:

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Animation:
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Music Credit

Ross Bugden- 'Drive'

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Sources: http://spartacus-educational.com/FWWinGermany.htm

Pictures: Wikimedia Commons (Public Domain)

Multiplying a vector by a scalar | Vectors and spaces | Linear Algebra | Khan Academy
Multiplying a vector by a scalar | Vectors and spaces | Linear Algebra | Khan Academy Teacherflix 44 Views • 2 years ago

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/vectors/e/scaling_vectors?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra

Watch the next lesson: https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/vectors/v/linear-algebra-vector-examples?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra

Missed the previous lesson?
https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/vectors/v/adding-vectors?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra

Linear Algebra on Khan Academy: Have you ever wondered what the difference is between speed and velocity? Ever try to visualize in four dimensions or six or seven? Linear algebra describes things in two dimensions, but many of the concepts can be extended into three, four or more. Linear algebra implies two dimensional reasoning, however, the concepts covered in linear algebra provide the basis for multi-dimensional representations of mathematical reasoning. Matrices, vectors, vector spaces, transformations, eigenvectors/values all help us to visualize and understand multi dimensional concepts. This is an advanced course normally taken by science or engineering majors after taking at least two semesters of calculus (although calculus really isn't a prereq) so don't confuse this with regular high school algebra.

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

Subscribe to KhanAcademy’s Linear Algebra channel::
https://www.youtube.com/channe....l/UCGYSKl6e3HM0PP7QR
Subscribe to KhanAcademy: https://www.youtube.com/subscr....iption_center?add_us

Comparing dot plots, histograms, and box plots | Data and statistics | 6th grade | Khan Academy
Comparing dot plots, histograms, and box plots | Data and statistics | 6th grade | Khan Academy Teacherflix 68 Views • 2 years ago

Sal solves practice problems where he thinks about which data displays would be helpful in which situations.

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-7th-compare-data-displays/e/comparing-data-displays?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade

Watch the next lesson: https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6-shape-of-data/v/shapes-of-distributions?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade

Missed the previous lesson? https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6-mad/v/mean-absolute-deviation-example?utm_source=YT&utm_medium=Desc&utm_campaign=6thgrade

Grade 6th on Khan Academy: By the 6th grade, you're becoming a sophisticated mathemagician. You'll be able to add, subtract, multiply, and divide any non-negative numbers (including decimals and fractions) that any grumpy ogre throws at you. Mind-blowing ideas like exponents (you saw these briefly in the 5th grade), ratios, percents, negative numbers, and variable expressions will start being in your comfort zone. Most importantly, the algebraic side of mathematics is a whole new kind of fun! And if that is not enough, we are going to continue with our understanding of ideas like the coordinate plane (from 5th grade) and area while beginning to derive meaning from data! (Content was selected for this grade level based on a typical curriculum in the United States.)

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

Subscribe to Khan Academy‰Ûªs 6th grade channel:
https://www.youtube.com/channe....l/UCnif494Ay2S-PuYlD
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Plotting complex numbers on the complex plane | Precalculus | Khan Academy
Plotting complex numbers on the complex plane | Precalculus | Khan Academy Teacherflix 66 Views • 2 years ago

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/algebra2/x2ec2f6f

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/precalculus/imaginary_complex_precalc/complex_num_precalc/e/the_complex_plane?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Watch the next lesson: https://www.khanacademy.org/math/precalculus/imaginary_complex_precalc/complex_num_precalc/v/complex-number-addition?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Missed the previous lesson?
https://www.khanacademy.org/math/precalculus/imaginary_complex_precalc/complex_num_precalc/v/complex-number-intro?utm_source=YT&utm_medium=Desc&utm_campaign=Precalculus

Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn't mean anything unless you have some knowledge of what calculus is. Let's keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore....precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen....an introduction to precalculus!

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

Subscribe to Khan Academy’s Precalculus channel:
https://www.youtube.com/channe....l/UCBeHztHRWuVvnlwm2
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

The Science of Teaching, Effective Education, and Great Schools
The Science of Teaching, Effective Education, and Great Schools Teacherflix 135 Views • 2 years ago

Scientific evidence suggests that the secret to thriving students and a good education are amazing teachers. To teach with us, gift a video or if you want Sprouts to make videos that teach your student or employees, contact us. Just visit http://patreon.com/sprouts


Add you favorite teachers to our playlist:
https://www.youtube.com/playlist?list=PLTp9Bu0cTGUzxe-zSFqVZCFmUh51otfDw&jct=37aFM_gENmVNgsjqXk85mQVocQEfTA

4 GREAT TEACHERS

Michael J. Sandel teaching Justice
https://www.youtube.com/watch?v=kBdfcR-8hEY

Robert Sapolsky teaching Introduction to Human Behavioral Biology
https://www.youtube.com/watch?v=NNnIGh9g6fA

Walter Lewin teaching Physics
https://www.youtube.com/watch?v=4a0FbQdH3dY

Mr. Hester Managing a Classroom
https://www.youtube.com/watch?v=geLvLd3uosk

ADD YOURS TO OUR PLAYLIST
https://www.youtube.com/playlist?list=PLTp9Bu0cTGUzxe-zSFqVZCFmUh51otfDw&jct=vP0U3P5UeAPMRQGBsSKCgsna9ak1Aw

Source:

Eric Hanucheck
http://hanushek.stanford.edu

Raj Chetty
Professor of Economics, Stanford University
http://www.rajchetty.com/chett....yfiles/value_added.h http://www.equality-of-opportu....nity.org/assets/docu

Cold Calling
https://www.youtube.com/watch?v=PARfIwF215k&list=PLPkJlPMF7vNsn8UmmQQwIC4sJYhQ2krrT&index=2

Sposato School of Education
http://www.sposatogse.org/

Teachers Effectiveness
http://scholar.harvard.edu/fil....es/fryer/files/dobbi

Time Spend by Principles
https://web.stanford.edu/~sloe....b/papers/Principal%2

What makes Teaching Great
http://www.suttontrust.com/wp-....content/uploads/2014

What Matters in School is Good Teaching
https://www.economist.com/news..../leaders/21700383-wh

Full Video Script:
https://docs.google.com/docume....nt/d/10Vv-jjXmmwpOIT

Photoelectric Effect, Work Function, Threshold Frequency, Wavelength, Speed & Kinetic Energy, El
Photoelectric Effect, Work Function, Threshold Frequency, Wavelength, Speed & Kinetic Energy, El Teacherflix 56 Views • 2 years ago

This chemistry video tutorial explains how the photoelectric effect works. It also explains how to use the work function of metals to calculate the threshold frequency and maximum wavelength of light necessary to eject an electron off the surface of an active metal. In addition, it explains how to calculate the speed of an electron as well as the kinetic energy of an electron in electron volts. You need to know how to convert electron volts to joules and vice versa. This video provides all of the formulas and equations needed including plenty of practice problems and examples.

Speed of Light, Frequency, Wavelength:
https://www.youtube.com/watch?v=LgYMxH1LCdo

Photon Energy:
https://www.youtube.com/watch?v=PYNSopwd1l4

The Photoelectric Effect:
https://www.youtube.com/watch?v=-LECEvusk8E

De Broglie Wavelength:
https://www.youtube.com/watch?v=cYyFPFU6s_A

The Bohr Model of Hydrogen:
https://www.youtube.com/watch?v=mXxsT1ut35Q

Heisenberg's Uncertainty Principle:
https://www.youtube.com/watch?v=BNYz5EKXVeI

________________________________
Intro to Quantum Numbers:
https://www.youtube.com/watch?v=eRIN9CPDrpo

Orbitals & Atomic Energy Levels:
https://www.youtube.com/watch?v=4sLXUr2HWIs

Maximum Number of Electrons:
https://www.youtube.com/watch?v=UNE-7AuiMGs

Intro to Electron Configuration:
https://www.youtube.com/watch?v=NIwcDnFjj98

Electron Configuration Exceptions:
https://www.youtube.com/watch?v=Ur2PuzJ7KWs

Noble Gas Notation:
https://www.youtube.com/watch?v=6MAKMnZdfbs

Electron Configuration of Ions:
https://www.youtube.com/watch?v=nlZa8lN_-Ds

_______________________________
Orbital Diagrams:
https://www.youtube.com/watch?v=6dRdMy9tgzE

Paired & Unpaired Electrons:
https://www.youtube.com/watch?v=xwWJf48yfNs

Aufbau's Principle & Hund's Rule:
https://www.youtube.com/watch?v=C6afrc1QS6Y

Paramagnetic & Diamagnetic Elements:
https://www.youtube.com/watch?v=SO983iq9GaI

Valence Electrons & Periodic Table:
https://www.youtube.com/watch?v=FPk2ziB9iX0

Effective Nuclear Charge:
https://www.youtube.com/watch?v=JDsMR1bHGO4

_________________________________
Slater's Rule:
https://www.youtube.com/watch?v=TaYUOiEe6OA

How To Identify The Element:
https://www.youtube.com/watch?v=4qwJIJUaIeQ

Quantum Numbers - Mega Review:
https://www.youtube.com/watch?v=lPptuKlCM6k

Quantum Numbers - Practice Test:
https://www.youtube.com/watch?v=E-nOH18dF-c

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

Ordinal Numbers | Jack Hartmann Ordinal Numbers Song
Ordinal Numbers | Jack Hartmann Ordinal Numbers Song Teacherflix 73 Views • 2 years ago

Ordinal Numbers by Jack Hartmann is an ordinal number song. In this version we use the calendar and students repeat the ordinal number after Jack. Follow the exercise for each set to build body and brain connections. Let's learn the ordinal numbers in this ordinal numbers for kindergarten video. Ordinal numbers for kids song.

Lyrics
Let's learn the ordinal numbers as we all work out
Let's learn the ordinal numbers repeat after me out loud
Ordinal numbers help us learn in many ways
They tell us the exact position or place
Stretch your arms the best you can and say the ordinal numbers after me
From 1st to 10th
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
Do leg squats the best you can and say the ordinal numbers after me
From 11th to 20th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
Twist your body the best you can and say the ordinal numbers after me
From 21st to 31st
21st
22nd
23rd
24th
25th
26th
27th
28th
29th
30th
31st
Ordinal numbers help us learn in many ways
They tell us the exact position or place
Let's learn the ordinal numbers




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Words and Music by Jack Hartmann
Copyright 2021
Jack Hartmann's Hop 2 It Music

Experimental probability | Statistics and probability | 7th grade | Khan Academy
Experimental probability | Statistics and probability | 7th grade | Khan Academy Teacherflix 51 Views • 2 years ago

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/cc-seventh-grade-

Based on past experience, we can make reasonable estimates of the likelihood of future events.

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-probability-statistics/cc-7th-basic-prob/e/finding-probability?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade

Watch the next lesson: https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-probability-statistics/cc-7th-basic-prob/v/intuitive-sense-of-probabilities?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade

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Grade 7th on Khan Academy: 7th grade takes much of what you learned in 6th grade to an entirely new level. In particular, you'll now learn to do everything with negative numbers (we're talking everything--adding, subtracting, multiplying, dividing, fractions, decimals... everything!). You'll also take your algebraic skills to new heights by tackling two-step equations. 7th grade is also when you start thinking about probability (which is super important for realizing that casinos and lotteries are really just ways of taking money away from people who don't know probability) and dig deeper into the world of data and statistics. Onward! (Content was selected for this grade level based on a typical curriculum in the United States.)

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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Russia's Invasion of Ukraine
Russia's Invasion of Ukraine Teacherflix 48 Views • 2 years ago

In the final years of the First World War, the Russian Empire was coming to its end. It had been devastated by revolution and finally transformed into the first Communist country in the World. In the years following the Revolution, non-Russian nations that lived under the House of Romanov sought to secure their long-lost independence. One of these was Ukrainе. From 1917 until 1921, the Ukrainians had struggled to build and secure an independent country, fighting against the new regime, against their neighbors in the west, and also among themselves.

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Created by Daniel Turner (B.A. (Hons) in History, University College London)
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Chris Kane
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Sources:
Magocsi, Paul R. A history of Ukraine. University of Toronto Press, 1996.
Plokhy, Serhii. The Gates of Europe: A History of Ukraine. Basic Books, 2021.
Reid, Anna. Borderland: A Journey through the History of Ukraine. Weidenfeld Et Nicolson, 2015.
Subtelny, Orest. Ukraine a History. Univ. of Toronto Press, 2012.
Ukrainian-Soviet War, 1917–21. Encyclopedia of Ukraine.

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