The Final Stage in Digestion
This very short video shows what happens when the digestion process comes to an end. It explains that solid waste is produced at the end of digestion.
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Solving Linear Systems of Equations Using Substitution
Solving Linear Systems of Equations Using Substitution - 3 complete examples are shown.
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Systems of Equations
Systems of equations. This video starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for older middle and high school students.
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Solving Systems by Substitution - Math Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by substitution, by first isolating one of the variables in the system, then substituting its value for the corresponding variable in the other equation.
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Solving Systems by Graphing - Algebra Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by graphing. The first step is to graph each of the given equations, then find the point of intersection of the two lines, which is the solution to the system of equations. If the two lines are parallel, then the solution to the system is the null set. If the two given equations represent the same line, then the solution to the system is th
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Solving Systems of Equations by Addition and Subtraction
This video discusses solving systems of equations through addition and subtraction.  Various examples are shown and the narrator solves the problems using a smart board. The problem examples appear a bit faint and small but are clear and dark when being solved with a marker.

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Solving Systems of Equations by Substitution
This lesson is for ntermediate Algebra Level.  In the lesson, Professor Burger shows how to solve systems of equations using a technique known as substitution. In this approach, students solve one equation for one of the variables (eg y) and then plug the value (what y is equal to) into into the other equation (anywhere a y appears). This substitution will allow you to solve for x and then in turn solve for y.  Professor Burger walks the viewer  through several different types of
example
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Conic Sections - Parabolas - Yay Math
Exploration of the parabola. Video reviews the axis of symmetry, the focus, the vertex. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-8824761396988762182&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Graphing Quadratic Equations (Parabolas) - Yay Math
An introductory lesson on graphing quadratic equations, aka parabolas. Demonstrates the role and effect of changing the co-efficients of terms in the quadratic equation on the graph of the parabola. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is
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Solving Quadratic Equations by Graphing
The instructor in this video, Sal Khan, uses a graphing calculator to solve quadratic equations. Mr. Khan uses computer software (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 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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Pre-Calculus: Complex Numbers - Trig or Polar Form
This video lesson instructs one on how to convert complex numbers into trig form (also known as polar form) and is a production of MindBites.
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PreCalculus - Functions
For each choice of independent variable x, there is one and only one corresponding value of dependent variable y. This is a very brief overview. (01:17)
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Solving Rational Equations - Yay Math
Many examples of manipulating fractions that include variables in order to solve equations. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-1558392479512220339&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Solving 3 equations having 3 variables - Yay Math
The video works through strategies for solving 3 equations having 3 variables. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=7858227191027997293&hl=en Produced by Robert Ahdoot, yaymath.org
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Synthetic Division - Yay Math
The video demonstrates synthetic division of equations. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=4571296703082266244&hl=en Produced by Robert Ahdoot, yaymath.org
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Nth Roots and Operations on Radicals - Yay Math
The video reviews square roots, cube roots, and fourth roots of numbers and variables. Then goes into some main properties of radical expressions, including removing radicals from the denominator. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=711499923819897326&q=source:012956945238798337823&hl=enProduced by Robert Ahdoo
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Square Root Functions and Inequalities - Yay Math
Working with and graphing square root functions and inequalities. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-990138912943122056&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Operations on Radical Expressions - Yay Math
This covers how to rationalize square roots, even complicated ones, such as square roots in the denominator and the square roots of variables.! This clip includes some subtitles to help you along. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=4688635244729629838&q=source:012956945238798337823&hl=en Produced by Robert Ahd
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Solving Radical Equations and Inequalities - Yay Math
Strategies for working with equations involving radical of multiple powers. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-4904897127356683094&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Simplifying Cube Roots
Students learn to simplify a square root by setting up a factor tree for the number inside the radical. If a factor pairs up in the factor tree, then it comes out of the radical. If a factor does not pair up, then it stays inside. Students also learn to simplify a cube root by setting up a factor tree for the number inside the radical. If a factor is part of a group of three factors that are the same, then it comes out of the radical. If a factor is not part of a group of three factors that are
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