## How many ways can letters be arranged

How many ways can we rearange the letters in the word MISSISSIPPI? In this video I show you how and why....

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How many ways can we rearange the letters in the word MISSISSIPPI? In this video I show you how and why....

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In a room full of six people, how many handshakes are there if everyone shakes hands exactly once?...

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Leonarduino a delta robot drawing with processing and Arduino. More information here: http://robottini.altervista.org/delta-robot-with-arduino...

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In this video I use math induction to prove the recursive and explicit functions are the same for all values n. proof by math induction....

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In this video I show what a conjugate is in mathematics and how it is used to rationalize a denominator....

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How to find the equation and focus of a parabolic mirror. I found this mirror in a 1930's arc projector. I will take that mirror and put some real stuff to the vocab of the prabola....

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Similar Triangles. How to find the missing lengths of sides on similar triangles....

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In this video I give another example of a one proportion z test, but in this case it is a two sided test....

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Here I go through a one proportion z test and show multiple methods to find the p-value. I show p-value with a TI nspire, Geogebra, and with tables. Hope this helps...

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In this video I show you how to calculate a z interval for a difference between two proportions. I use both the free online software geogebra.org and the TI-nspire to calculate the confidenc interval....

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I go through an example of a two proportion z test for significance and show how to use some of the features of the TI -nspire and Goegebra.org to perform the test....

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This is not a why video. Here I show how to use the converse of the pythagorean therom....

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In this video I derive the equation of a parabola that opens up and down using the distance formula. Then I challenge you to derive the general equation of a parabola opening left and right. I use the ordered pair (x,y) and the distance from vertex to d...

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In this video I give another example of a one proportion z test, but in this case it is a two sided test....

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In this video I show how to simplify a square root or rationalize a denominator....

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In this video I show why the denominator is rationalized in a square root. I am probably over simplifying things, but essentially we rationalize to use the division algorithm....

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How to derive the equation of a circle. I start out just showing the equation in action with the program geogbra. Then use the distance formula to prove the equation of a circle....

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In this video I show you the two triangle situations where you use the law of cosine. . . SAS and SSS....

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How to use the law of sine. Sorry. It is a little raw. I am making this quickly for a student....

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How to use th angle bisector theorem. I did not include a proof. Maybe later. For now just very happy if my students can use the theorem....

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Here are some basic problems that deal with angle of elevation, angle of depression and grade....

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In this video I introduce the significance test with simulations. It is not a formal significance test. Just a way to introduce the main components of the test....

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Special Right Triangles How to solve for the 45 45 90 right triangle and the 30 60 90 right triangle....

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How to graph an ellipse that is not in standard form. Find major axis, minor axis, center, distance to foci from center, vertices, and eccentricity....

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How to graph an ellipse in standard form. Find major axis, minor axis, center, distance to foci from center, vertices, and eccentricity....

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How to rough sketch a nyperbola when the equation is not in standard form....

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In this video I give two examples of sketching hyperbola by hand. Find the verteces, asymptotes, foci, equations of asymptotes...

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The side splitter theorem without the proof. The last video I made went 20 minutes becuase I added the proof. So this video just gets you started....

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This is a long video. Don't watch it all if you are not interested in the proof. I give four good examples at the begining that take up 9 minutes and then a proof that takes 9 minutes...

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How to use sine cosine and tangent on a right triangle SOH CAH TOA in action....

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Ever wonder why the trig ratios work. I have taught how to use them for years without anyone asking me why they work. Well today I show you with the help of proportion properties and similar figures....

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The symbol for percent and what to do with it is often confusing. Teachers have confused a simple concept by making students memrorize"move the decimal left two places when you see a percent sign." This makes math seem more like whitchcraft and less abo...

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How to add and subtract signed numbers. Ever wonder what a signed number really is? I think most students in the United states are taught to operate on signed numbers without really understanding those numbers. Here is my attempt to help out....

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Two example problems that show how to solve a right triangle. These two examples are the two main examples for problems like this. There are other situations, but I build these videos so that my students have a way to study for the tests....

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When I have students sketch the graph of a quadratic I have them find 5 important things. They should tell whether the graph opens up or down, the axis of symmetry, the vertex, the y-intercept, and the x-intercepts if the graph has them. This shows the ...

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In this video I introduce the geometry terms complementary, supplimentary, and linear pair. I also show some common textbook problems and how to solve them....

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17 minutes is a long video. But the end of the video is the proof of the vertical angle theorem. Everything up to that point explains what vertical angles, linear pair, and adjacent angles are. It also gives some typical example problems....

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In this video I give the basic ways to name and measure angles. I use a digital protractor...

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I use video technology to try and illistrate why a negative times a negative is a positive. Or more precisly ... why is the product of two negative numbers positive?...

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How to find the area of an octagon with right triangle trigonometry....

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How to find the area of a regular pentagon with right triangle trigonometry....

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How to find the area of a regular hexagon. I did not use the traditional formula. half the product of the perimeter of the base and the apothem....

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In this video I give two common examples of problems found in a high school geometry class or a college entrance exam. I use special right triangles, pythagorean theorem, and pythagorean triples to solve, along with some Sine and Cosine....

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The area of kites and rhombus with pythagorean theorem in the problems....

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In this video I show some common problems dealing with area in a college entrance exam. These require right triangle trig to solve....

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Here we estimate the population mean difference in weight of oreo double stuf and original cookies to see if Double Stuf Oreo cookies are twice the stuffing of original oreos. two sample confidence interval...

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This is a two sample t test to determine if Oreo cookies have twice the stuffing of Original Oreo Cookies....

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