Illustration of online tutoring.

This animation represents level surfaces of the function f(x,y,z) = x^2 +y^2 -z^2. The graph of this function is a 3-dimensional solid in a 4-dimensional space - a hypersurface!

Have you been to Lincoln Center? There is a curious structure that looks like a twisted roof. In the summer, this twisted roof is covered with grass. Well, it seems to me that the roof is just a rectangular cutout of the graph of the multiplication...

Although one often thinks of a gentleman's hat, a cylinder is any surface generated by dragging a curve in the 3 dimensional x, y ,z coordinate frame along the x, the y, or the z-axis.
In this particular example, the cylinder is generated...

The paraboloid z = x^2 + y^2 has a much simpler formula in polar coordinates. This formula is z = (r cos t)^2+(r sin t)^2 = r^2.

Basic tutorial on how to represent real world situations (i.e. Pizza!) into fractions and percents.

This is a sample beginning phonics online lesson.

The surface z = x^2 -y^2 is generated by sliding the curve z = -y^2 from the y-z plane along the curve z = x^2 in the x-z plane.

The surface z = (x^2 - y^2)/(x^2 + y^2) has the simple equation z (r, t) = Cos (2 t) in cylindrical coordinates. The surface is therefore obtained by wrapping the graph of the curve z = Cos (2 t) on a circular cylinder and then expanding this...

In this video, I walk through how to use dimensional analysis to solve the question: How many seconds are in one year?
Information that I used
1 year = 365 days
1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds
The...

This video describes the history of Microbiology from its inicial use of lenses by lenscrafters and cloth merchants interested in the microbial world, to the developments of microscopes by Galileo Galilei and other naturalists to the final debate...

Learn something about the Spanish Alphabet.

In this video you will be able to learn how to introduce yourself, how to say your name, and how to spell it, affirmative and negative sentences.

Herb E.'s introduction to tutoring.

A summary of WyzAnt tutor Deborah H's background in tutoring, English and Spanish.

Dr. Todd R., saxphone professor at San Diego State University, CA.
A public saxphone recital at YAMAHA Recital Hall acompanied by Christine Chuang.
Fuzzy Bird, 1st movement.

This piece is by Schumann Fantasy Pieces Op.73, the 1st movement. Accompanied by Christine Chuang.

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