Khan/khan-exercises — Issue #9894: Parabola intuition 3 - Multiple again
Author: KhanBugz
Created: 2011-12-30 18:46:02+00:00
State: open
Labels: firefox, other, scratchpad, win7

Reporter: christilin@msn.com

I promise I'll stop sending new issues soon. Only 2 exercises left ;-)

1) Scratchpad not available. Yes, I know that it is because this is interactive, but it's hard not being able to scribble out the numbers to solve. With the fractions and different formulas it would be nice to see rather than have to keep it all in my head.

(I won't repeat the comments about the "Report a problem" form)

2) The "acceptable answer" part may be a little confusing. Is the user required to move around the focus and directrix in order to get the answer right? (Yes it's useful, but maybe more this into a hint under the problem.)

3) Love the "Show me" button. One suggestion... If we want the student to move around the stuff, maybe show the spots (as other exercises do) with an unmovable element in a different color.

4) Maybe toss in some problems that have integer solutions? Seems like almost all of the problems I've done have been fractions (usually 1/8 multiples).

[parabola_intuition_3.html?seed=22&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=22&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=22&problem=0&debug&activity=%5B%5B%22correct-activity%22%2C%22%5B%5C%22-3%2F8%5C%22%2C%5C%22-1%5C%22%2C%5C%22-1%2F8%5C%22%2C%5C%22-0.125%5C%22%2C%5C%22-0.625%5C%22%2C%5C%22-0.125%5C%22%5D%22%2C136%5D%5D)

[["-3/8","-1","-1/8","-0.125","-0.625","-0.125"]]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0

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