This precalculus video provides a basic introduction into addition and subtraction of matrices. It contains plenty of examples and practice problems on how to add and subtract matrices.

Introduction to Matrices: https://www.youtube.com/watch?v=yRwQ7A6jVLk

Adding and Subtracting Matrices:
https://www.youtube.com/watch?v=QXUbFzEd3Ww

Scalar Multiplication of Matrices:
https://www.youtube.com/watch?v=iJERwUVuwtY

Solving Matrix Equations:
https://www.youtube.com/watch?v=UHhvcj0doaA

Multiplying Matrices:
https://www.youtube.com/watch?v=vzt9c7iWPxs

__________________________________
Gaussian Elimination & Row Echelon Form:
https://www.youtube.com/watch?v=eDb6iugi6Uk

Gauss Jordan Elimination:
https://www.youtube.com/watch?v=eYSASx8_nyg

Gaussian Elimination With 4 Variables:
https://www.youtube.com/watch?v=4VAXv6yRULU

Inverse of a 2x2 Matrix:
https://www.youtube.com/watch?v=aiBgjz5xbyg

Inverse of a 3x3 Matrix:
https://www.youtube.com/watch?v=Fg7_mv3izR0

__________________________________
Determinant of 2x2 and 3x3 Matrix:
https://www.youtube.com/watch?v=3ROzG6n4yMc

Determinant of 4x4 Matrix:
https://www.youtube.com/watch?v=fWzUwrt1Z0s

Cramer's Rule - 2x2 Linear System:
https://www.youtube.com/watch?v=vXqlIOX2itM

Cramer's Rule - 3x3 Linear System:
https://www.youtube.com/watch?v=Ot87qLTODdQ

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

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

This calculus video tutorial provides a basic introduction into absolute convergence, conditional convergence, and divergence. If the absolute value of the series convergences, then the original series will converge based on the absolute convergence test. If the absolute value of the series diverges and if the original series is convergent, then the series is conditional convergent. This video contains examples and practice problems with the p-series, and the alternating series.

Integral Test For Divergence:
https://www.youtube.com/watch?v=f9SJz4-UaQQ

Remainder Estimate - Integral Test:
https://www.youtube.com/watch?v=vaU5DDcTfZk

P-Series:
https://www.youtube.com/watch?v=x621rtIwb_4

Direct Comparison Test:
https://www.youtube.com/watch?v=oZtAgihok5s

Limit Comparison Test:
https://www.youtube.com/watch?v=LBxYQ0TJxYM

_________________________________
Alternating Series Test:
https://www.youtube.com/watch?v=DRO1kPT4iS8

Alternate Series Estimation Theorem:
https://www.youtube.com/watch?v=FkUrAgBzAZo

Absolute & Conditional Convergence:
https://www.youtube.com/watch?v=FPK6LO1iiXc

The Ratio Test:
https://www.youtube.com/watch?v=kkfILYpkJS8

The Root Test:
https://www.youtube.com/watch?v=ahf0eXOll1M

__________________________________
Series Tests - Practice Problems:
https://www.youtube.com/watch?v=0YeON4p0ogw

Taylor & Maclaurin Polynomials:
https://www.youtube.com/watch?v=urPIxvNBXF0

Taylor's Remainder Theorem:
https://www.youtube.com/watch?v=lY0LzJXTgeo

Power Series - Interval Convergence:
https://www.youtube.com/watch?v=EGni2-m5yxM

Power Series - Derivatives & Integrals:
https://www.youtube.com/watch?v=nD6hai32ykQ

___________________________________
Calculus Final Exam and Video Playlists:
https://www.video-tutor.net/

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

This statistics video tutorial explains how to calculate the variance of a sample.

Introduction to Statistics: https://www.youtube.com/watch?v=XZo4xyJXCak

Arithmetic, Geometric, & Harmonic Mean:
https://www.youtube.com/watch?v=6G6i8vSa8Zs

Cumulative Relative Frequency Table:
https://www.youtube.com/watch?v=6hJGa4Zp62M

Quartiles, Deciles, & Percentiles:
https://www.youtube.com/watch?v=40o82o3uNfk

Interquartile Range & Outliers:
https://www.youtube.com/watch?v=STSP8gTSdT8

___________________________________
Skewness & Symmetric Distribution:
https://www.youtube.com/watch?v=U0NZu6f5TMI

Sample Mean and Population Mean:
https://www.youtube.com/watch?v=cmtBUWCC-6A

Mean, Median, & Mode - Grouped Data:
https://www.youtube.com/watch?v=zjHfAhcU6kE

Standard Deviation:
https://www.youtube.com/watch?v=IaTFpp-uzp0

Variance:
https://www.youtube.com/watch?v=deIQeQzPK08

___________________________________
Mean Absolute Deviation:
https://www.youtube.com/watch?v=K4heM9mSrw0

Standard Deviation of Grouped Data:
https://www.youtube.com/watch?v=x6Pnf57wRAs

Introduction to Probability:
https://www.youtube.com/watch?v=SkidyDQuupA

Probability Formulas:
https://www.youtube.com/watch?v=bddckR734aM

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

This calculus video tutorial explains how to sketch the derivatives of the parent function using the graph f(x). This video contains plenty of examples and practice problems.

My Website: https://www.video-tutor.net
Patreon Donations: https://www.patreon.com/MathScienceTutor
Amazon Store: https://www.amazon.com/shop/th....eorganicchemistrytut

Subscribe:
https://www.youtube.com/channe....l/UCEWpbFLzoYGPfuWUM

Here is a list of topics:
1. Sketching Derivatives of Parent Functions
2. Quadratic Function / Parabola f(x) = x^2
3. Linear Functions 2x
4. Cubic Functions x^3
5. Trigonometric Functions - Sine and Cosine - sin(x) and cos(x)
6. Increasing and Decreasing Functions
7. Relative Extrema of a Function and the Derivative f'
8. Graphing The First and Second Derivative of a Function
9. Local Maximum and Minimum Calculus
10. Critical Points and Inflection Points
11. Relative Maximum and Minimium of Using the First Derivative Graph
12. Critical Points and Extrema - Calculus
13. Concavity, Inflection Points on Graph of f'(x) - First Derivative
14. Identifying the Horizontal Tangent Lines

Disclaimer: Some of the links associated with this video may generate affiliate commissions on my behalf. As an amazon associate, I earn from qualifying purchases that you may make through such affiliate links.

Who was the Red Baron?

Manfred von Richthofen is the most famous fighter pilot ace of world war I.

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http://ckvox.com/

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artwork:
daniel turner

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In broad daylight the James-Younger Gang, wearing masks rode into the small community of Gads Hill in the wilderness of south-eastern Missouri. They planned to use this settlement in the middle of nowhere to stop a train carrying a safe and lots of passengers..

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Credit:
Created by Daniel Turner

Narrator:

Chris Kane
www.vocalforge.com


Sources:
Jesse James and the First Missouri Train Robbery
By Beights, Ronald H.
http://www.jcs-group.com/oldwe....st/outlaw/legend.htm
http://www.civilwarstlouis.com..../Reviews/missouritra
http://www.jcs-group.com/oldwe....st/outlaw/legend.htm
http://www.civilwarstlouis.com..../Reviews/missouritra
https://sundowntrailblog.com/2....013/01/14/the-gads-h
http://www.angelfire.com/mi2/j....amesyoungergang/gads

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Thanks to Keeps for sponsoring this video!

As the British Empire spread across the globe in the 16th and 17th centuries, a whole new set of challenges started to emerge.
Like how to live at the sea for many months without letting most of your sailors get sick or die!


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Credit:
Created by Daniel Turner
Script: Conan White
Narrator:

Bryan 'Lazlo' Beauregard




Sources:

The History of Scurvy and Vitamin C
By Kenneth J. Carpenter

Observations on the scurvy: with a review of the theories lately advanced on that disease ; and the opinions of Dr. Milman refuted from practice
By Trotter, Thomas, 1760-1832

Free Observations On The Scurvy, Gout, Diet, And Remedy. By Francis Spilsbury, ... The Third Edition

An Essay on the Sea-scurvy: Wherein is Proposed an Easy Method of Curing that Distemper at Sea; and of Preserving Water Sweet for Any Cruize Or Voyage. By Anthony Addington, M.D

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In 1860, a newly formed company called ‘The Pony Express’, came up with a simple, yet ingenious solution.
Using horses, they delivered letters faster and much more efficiently than ever before by using relays of horse-mounted riders.

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Credit:
Created by Daniel Turner
Script: Conan White


Narrator:
Bryan 'Lazlo' Beauregard

Music Credit:


Sources:
The Pony Express
Bringing Mail to the American West
By Tim McNeese · 2009

The Pony Express: Bringing Mail to the American West
By Tim McNeese

The Pony Express: A Primary Source History of the Race to Bring Mail to the American West
Book by Simone Payment

The Pony Express in Nevada Paperback – January 1, 1981
by John et al. Ranger

Pony Express: An Illustrated History
By Carol Guthrie, Bart Smith

Watch some of history's scariest stories..


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Created by Daniel Turner (B.A. (Hons) in History, University College London)

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War is all about eliminating the enemy before he gets a chance to eliminate you.
Throughout History, during conflicts and rebellions and wars, it has not been unusual for soldiers to be killed by their own side, either deliberately or by accident.
Friendly Fire or Fratricide relates to “accidental damage by allied troops to one’s own installations, aircraft, or personnel.” Friendly accidents that result in the deaths of fellow soldiers, often also referred to as a blue on blue incident, can happen quite easily, even in modern warfare where highly sophisticated weapons and reconnaissance equipment are involved. Friendly Fire has always been commonplace in warfare and will, unfortunately, continue to occur.


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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Dejan Milivojevic
Narrator:

Chris Kane
https://vocalforge.com/

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“Ladies from Hell”
In the history of the British Armed Forces, there have been many Regiments whose glory and fame was forged on battlefields across the world. However, there is a unit whose devotion to duty and gallantry earned it the honour to be ranked among Britain's finest. These are the men of the 3rd Battalion, the Royal Regiment of Scotland. This is the unit of Scottish Highlanders, also known as the Black Watch.


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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Dejan Milivojevic
Narrator:

Bryan 'Lazlo' Beauregard

https://pastebin.com/T8GiGFVQ

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In the movies we see pirates burying their treasure, but how common was it in real life?


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Credit:
Created by Daniel Turner

Narrator:

Chris Kane
www.vocalforge.com


Music Credit

Celtic Impulse - Celtic 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/

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Between 1972 and late 1973, there was a series of mysterious meetings in an underground car park near Washington D.C. between Washington Post journalist Robert ‘Bob’ Woodward and a mysterious anonymous informant..

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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Conan White
Narrator:

Chris Kane
https://vocalforge.com/


Sources


Watergate: Scandal in the White House
By Dale Anderson
The Watergate Crisis
By Michael A. Genovese

Watergate: A Brief History with Documents
edited by Stanley I. Kutler

Focus on Watergate: An Examination of the Moral Dilemma of Watergate in the Light of Civil Religion Hardcover – 1 Dec. 1982
by H Dale Crockett

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Show Created by Daniel Turner (B.A. (Hons) in History, University College London)

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Credit:
Created by Daniel Turner

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Christian H Miles

Music Credit

Under Cover - Wayne Jones

car designs-Created by Freepik

Learn about dialog and other reading comprehension lessons in the FREE Khan Academy Kids app! https://go.learn.khanacademy.o....rg/khanacademy/YouTu

Reya and Sandy look at the pictures in the book to understand the mood of the story. They talk about how the pictures make them feel: worried, scared, happy, or peaceful.

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade available on Apple, Google Play, and Amazon app stores.

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Rainy days are good days to practice letters! The letters "a" and "y" team up to make the long /ā/ sound. The letters "a" and "i" team up to make the long /ā/ sound too. Learn about vowel teams with Reya the Red Panda from Khan Academy Kids.

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade.

Available on Google Play, Apple, and Amazon app stores:
➡️ http://khan.co/KhanKids-YT-Google
➡️ http://khan.co/KhanKids-YT-Apple
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We launched the Khan Academy Kids YouTube channel as a place for parents and kids to access learning resources. For parents, it is about putting all the resources you need to use our app at your fingertips. For kids, join us for Circle Time every other Monday, a fun space to read and play with friends!

Khan Academy Kids is an award-winning educational app for young learners ages two to seven. The app engages kids in core subjects like early literacy, reading, writing, language, and math, while encouraging creativity and building social-emotional skills.

Learn more about Khan Academy Kids, our free educational app for children ages 2-7 at http://www.khankids.org.

Download now!
http://khan.co/KhanKids-YT-Google
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The word "day" is spelled d-a-y. "Day" is the time of light between one night and the next. Kodi plays during the day when it's light outside!

Learn the sight word "day" with the Khan Academy Kids characters. The fun example, easy-to-remember definition, and cute illustrations will help kids remember the word any time they come across it.

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade.

Available on Google Play, Apple, and Amazon app stores:
➡️ http://khan.co/KhanKids-YT-Google
➡️ http://khan.co/KhanKids-YT-Apple
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You can also access other sight words videos on our Sight Words playlist here: http://khan.co/KhanKids-SightWords.

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