A comment in the pdf attachment I made above:
"It seems that you can modify “on the fly” without
affecting the students too much as long as you
don't alter the random number stuff."
I would like to add that images are cached; if you do something to change the look of a graph you might want to reassign the problem so that the student gets the new "look"
hp
WeBWorK Problems
Executable example problems?
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