Scaffolding looks like it might work. How do I access the student answer? In order to set a variable equal to it, if it doesn't have to be the correct answer.

I checked

http://webwork.maa.org/wiki/Custom_Answer_Checkers#.VCCWdRburvY

but could understand how.

Example: part 1 - student chooses a frequency F for a sinusoid (1<= F <= 10).

I'll accept any answer as correct if it is in the interval [1,10].

part 2 - I draw a graph using the student's frequency F + dF, a random number and ask the student if this is the correct graph. If dF = 0, it is, if dF != 0 it is not.

this is not the complex problem that I'd use but it illustrates the concepts I'm after.

thanks!!

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