Hi, I'm Vicki, bilingual tutor...
Here to help you learn English (ESL), or Chinese! :)

This timer will help you practice TOEFL Speaking Questions 1 and 2. This video provides preparation and response timing.

I cover both the case of a monomial dividing into a polynomial, and the case the monomial is not a factor of the polynomial. Give it a view and tell me how you like it.

Learn Spanish and sign Language with me.... feel free to contact me.

A video showing the detailed procedure to do long division of numbers.

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!

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...

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.

I teach German conversation, German translations for businesses and private. German classes are one-on-one, or in groups.

Take German lessons from a native Swiss. Individuals or groups. German for fun or business. Translations. Skype lessons available.