Show the class two methods to solve proportions of fractions. The instructor shows that complex proportions can be solved by the normal method of cross-multiplying. It also shows another method where the complex fractions are simplified...

Fractions, money, and a word problem? Write out an equation that has a fraction as the numerator of a fraction. Huh? Confusing? Don't give up! Watch the video as the instructor illustrates and explains how to solve this seemingly...

This video shows how to find an unknown quantity in a proportion in the context of a word problem. Practice problems are available. [5:48]

Video tutorial demonstrates how to solve a percent proportion using the means-extremes property of proportions to cross multiply. [1:09]

Video deriving the triple product expansion by expanding the cross product of 3 vectors and then simplifying it to the difference of dot products.

Video finding the normal vector to a plane using its equation by first visualizing the vector and the plane and then solving for it.

Thi videoreviews the Cauchy-Schwarz inequality and then shows a proof of the triangle inequality for vectors and relates it to the triangle inequality from 2-dimensional geometry.

PVideo first explains what the Cauchy-Schwarz inequality is and then shows a proof of it.

This video gives an intuition of what dot product and cross product represent. Also gives a comparison between cross product and dot product of vectors and how they are related.

Video lecture provides a little more intuition on the cross product. [10:53]

A video lecture that introduces how to do the cross product. Understand how crossing two vectos produces a third vector. [10:03]

This lesson introduces the cross product