Question 1161536
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Let *[tex \Large x] represent the number of questions answered correctly, and let *[tex \Large y] represent the number of questions answered incorrectly.  Then:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ y\ =\ 30]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 20x\ +\ 10y\ =\ 180]


Note $1.80 is 180 cents


Solve the 2X2 system for *[tex \Large x] and *[tex \Large y]
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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