In this letter to Dr Andreas Schleicher, director of the OECD’s Programme for International Student Assessment, academics from around the world express deep concern about the impact of Pisa tests and call for a halt to the next round of testing. www.theguardian.com
I found the page http://fooplot.com which plots nice function graphs in a fast and easy way. You might define the range for the input variable x as well as for the output y, and you can plot different function graphs on the same window with different colours. The following screenshot is from an example with a fitting curve and two interpolations.
The following might be useful if you scan some images and want to convert between formats.
Use mogrify from the ImageMagick package in order to convert more than one image at once from one format to another.
From PDF to JPG:
mogrify -format jpg -quality 80 -density 300 *.pdf
From JPG back to PDF:
mogrify -format pdf *.jpg
Watch this 10-minutes Video from KhanAcademy.
I’d like to share a powerful cheat sheet for Edmodo that I stumbled across today. It’s available on Google Drive right now but I’ve embedded it below to make your life a little bit easier. www.edudemic.com