How can I generate a graph server-side, and update it client-side? [more inside]
Asking for a colleague: "Back in October 2008, I found a free online app that uploaded data from Excel and produced (very pretty) charts and graphs. Unfortunately, I didn’t keep track of the website, and I’m having trouble tracking it down again. Most of the free graphing apps I’ve found online today require that you manually input the data; I’m looking for something that will more easily upload a set of data from Excel."
What are the best math instructional sites, resources and (especially) tools for graphing and math visualization these days? [more inside]
Warning: wait to read this question until tomorrow if you are in Learned League. So, today one of the Learned League questions was, What is the y-intercept of the line with the following equation?: 3y-11x = 39. I couldn't get any further than y = 13 + 3 2/3 x or y = 13 +3.66666x. Actually it appears the response is 13. How does one get to the right response for this question?
Is there an easy-to-use computer program (other than TI Interactive) I can use to draw graphs of functions when I'm writing my Algebra 2 tests? [more inside]
How do I graph these data using R's plot() and barplot() commands? [more inside]