The insructorÂ uses y=x^2 to give a sense of why the change in the change of y (or the change in the slope) is constant. This instructor in this video, Sal Khan,Â explains quadratic models.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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Graphs of Quadratic Functions
This instructor in this video, Sal Khan,Â shows examples of graphingÂ quadratic functions.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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Solving Quadratic Equations by Completing the Square
This instructor in this video, Sal Khan,Â explainsÂ how to solve quadratic equations by completing the square.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen
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Factor by Grouping and Factoring Completely
This instructor in this video, Sal Khan,Â discusses how to factor by grouping andÂ how to factor completely. Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Factoring Special Products
This instructor in this video, Sal Khan,Â discusses how to factor special products. Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Sum of Consecutive Odd Integers (How to Solve)
In this video, Sal Khan demonstrates how to solve for x using a single problem.Â Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education.Â  (04:33) There is a lot of information on the screen--the viewer may want to open the video to 'full screen.'Â
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Solving Quadratic Equations by Graphing
The instructor in this video, Sal Khan,Â uses a graphing calculator to solve quadratic equations.Â Mr. Khan usesÂ computer softwareÂ (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The viewer may want to open the video to 'full screen' as the instructor fits a lot of information on a dark screen.
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Introduction to Function Inverses
Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (09:05)
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Function Inverse Example 1
Function Inverse Example 1: f(x)= -x+4
This is a continuation of Mr. Khan's Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (06:43)

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Function Inverses Example 2
Function Inverse Example 2: f(x)= (xÂ +Â 2) squared +1
This is aÂ another installmentÂ of Mr. Khan's short 4-part series on FunctionÂ Inverses.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a little low. (07:12)

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Function Inverses, Example 3
Function Inverse Example 3: f(x)= (xÂ - 1) squared -2
This isÂ the lastÂ segmentÂ of Mr. Khan's short 4-part series on FunctionÂ Inverses.Â TheseÂ installments started with Khan's Introduction to Function Inverses. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The screen gets busy (and dark)--the viewer may want to open to 'full screen' to see everything. The sound is a l

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Matrix Multiplication (Part 1)
The instructor demonstrates how to multiply two 2x2 matrices. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Matrix Multiplication (Part 2)
The instructor uses an electronic chalkboard to demonstrate Matrix Multiplication. Â At the time of this posting from WatchKnow, this video was a Featured Video on YouTube. The instructor, Sal Khan,Â continues from Part 1 on multiplying matrices. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Algebraic Word Problem
In this video, Sal Khan demonstrates how to solve an algebra word problem.Â Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education.Â  (08:01) There is a lot of information on the screen--the viewer may want to open the video to 'full screen.'Â
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Mixture Problems, Part 3
The instructor in this video, Sal Khan,Â continues to discuss solving mixture problems. This problemÂ involves percentages and how to use a table toÂ help solve the problem.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Mixture Problems, Part 2
The instructor in this video, Sal Khan,Â continues to discuss solving mixture problems. This problemÂ involves percentages and how to use a table toÂ help solve the problem.Â Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Mixture Problems, Part 1
The instructor in this video, Sal Khan,Â introduces his discussion on how toÂ solve mixture problems.Â The video is clear and easy to understand. Mr. Khan uses the Paint Program (with different colors)Â to illustrate his points. Sal Khan is the recipient of the 2009Â Microsoft Tech Award in Education. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small.
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Italians in the world - part 2
This episode discusses Father Bandini, an Italian emigrant, who can to the United States with his parishioners.  They import seeds and grubs from Italy and plant new land.  There apples, corn, and onions become famous.  Francesca Cabrini also emigrates she will be a saint, the first American saint.  Life is hard for all those who emigrated, even for a saint.  The Church in the States if formed mainly by Irish priests and it is not open to the new emigrants.  S
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Decomposition of the Body
Documentary- Click off the crime show and foray into the real world of forensics. At a unique open-air crime lab known as the Body Farm, decomposing corpses help detectives solve murders. Addresses decomposition and decomposers, however images of decaying bodies may be extremely disturbing for younger children. Run time 03:37

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Ali Baba and Forty Thieves Part 1 of 2
Animated cartoon of the old Persian tale.Â  The young Ali Baba collects valued fire-wood in the forest and happens to overhear a group of forty thieves visiting their treasure store in the forest where he is cutting wood. The treasure is in a cave, the mouth of which is sealed by magic. It opens on the words "Open, Simsim" (commonly written as "Open Sesame" in English), and seals itself on the words "Close, Simsim" ("Close Sesame"). When the thieves are gone, Ali Baba enters the cave himself, an
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