Khan Academy: Quick Tip: Use the Docs!

In webpage design the CSS rule tells which HTML element to style by using selectors based on their tag names.

A GIF illustrates the motion of "number scrubber".

A GIF of the color picker finding the correct color.

Video defining an orthogonal matrix as a square matrix C whose columns form an orthonormal set. Shows that C will be invertible and that multiplying C transpose by C will result in the identity matrix. The result that C transpose equals...

Video demonstrates through several examples how to solve inequalities using multiplication and division of positive and negative numbers. Practice problems available. This video is also found in the strand Algebra: ck12.org. [10:27]

Video shows how to solve and graph inequalities using subtraction or addition. Practice problems available. This video is also found in the strand Algebra: ck12.org. [7:48]

Using the interactive tool, construct curves using repeated linear interpolation.

Solve advanced equations by strategically using quadratic factorization methods.

The sequel to Polar Coordinates 1 from the Khan Academy, this segment goes through some examples on converting polar coordinates to rectangular coordinates and converting a Cartesian equation to a polar equation. Graphing is also used to...

This video follows from Khan Academy: Sequences and Series (Part 1) and furthers the idea of the basic geometric series. Explains how to find the sum of both a finite and an infinite geometric series. Uses limits to find the sum of an...