Curated Video
Computing Successive Percentages: Proportions and Equations
In this video, we look at an example of calculating the final price of a computer that was on sale for 30% off, with an additional 15% discount from a coupon and a 7.25% tax rate. The teacher emphasizes the importance of understanding...
Krista King Math
Complex Fractions, Ratio and Proportion
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...
Curated OER
How Do You Solve a Word Problem That Compares Two Complex Fractions?
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...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Find an Unknown in a Proportion 2
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]
Virtual Nerd
Virtual Nerd: How Do You Solve a Proportion Using Cross Products?
Video tutorial demonstrates how to solve a percent proportion using the means-extremes property of proportions to cross multiply. [1:09]
Khan Academy
Khan Academy: Vector Triple Product Expansion (Very Optional)
Video deriving the triple product expansion by expanding the cross product of 3 vectors and then simplifying it to the difference of dot products.
Khan Academy
Khan Academy: Vector Dot and Cross Products: Normal Vector From Plane Equation
Video finding the normal vector to a plane using its equation by first visualizing the vector and the plane and then solving for it.
Khan Academy
Khan Academy: Vector Dot and Cross Products: Vector Triangle Inequality
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.
Khan Academy
Khan Academy: Proof of the Cauchy Schwarz Inequality
PVideo first explains what the Cauchy-Schwarz inequality is and then shows a proof of it.
Khan Academy
Khan Academy: Dot and Cross Product Comparison/intuition
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.
Khan Academy
Khan Academy: Electricity and Magnetism: Cross Product 2
Video lecture provides a little more intuition on the cross product. [10:53]
Khan Academy
Khan Academy: Electricity and Magnetism: Cross Product 1
A video lecture that introduces how to do the cross product. Understand how crossing two vectos produces a third vector. [10:03]
