Sinusoidal Regression Using Graphmatica 

Creating Classroom Materials (An Update of my Previous Video) 

Spreadsheet Basics - Part 1, Entering Data 

    http://youtu.be/iElad9fZRz8

Spreadsheet Basics - Part 2, IF and AND commands 

Spreadsheet Basics - Part 3,  Displaying Text with User-Defined Input, Conditional Formatting