This is a QR code. A QR Code is a 2-dimensional barcode, which has encoded in it a URL (web address), text, or other information. It can be read by a QR code scanner, including QR scanner smartphone apps. Once you have an app installed on your smartphone, open the app and hold your phones camera over a QR code to read it. Most QR codes youll come across have a URL encoded, so chances are when you read the QR code it will take you to a web page.
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With the ""Graphing Vector Caculator"" you draw two vectors then command it to add or subtract the vectors by pressing a button ( "A + B", "A - B", "B + A", "B - A" ). The graphical and numerical representations for all the vectors are shown, in matching colors, and all the digits are in neatly aligned columns.
John Walkup (Staff)
similar applets available that work a little better.