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Speed Bump Differential Quotient: Explainer Video
Screencast with two GeoGebra files introducing the difference quotient assuming that the slope of a line through two points has been repeated recently.
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Microsoft Excel: Insert and delete rows and columns
In this tutorial video, you will learn how to add or remove rows and columns in Microsoft Excel.
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Microsoft Excel: Insert header and footer
In this instructional video you will learn in an easy way how to insert headers and footers in Microsoft Excel.
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Instruction video: Share files with Dropbox
This instructional video shows how you can share files with dropbox.
There is step by step how you download and install the program, how to create an account and how you can then share files with others.
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