Question 1001872
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{12}{30}\ =\ \frac{x}{5}]


Cross-multiply:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ (5)(12)\ =\ 30x]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ =\ 2]


The rest is simply substitution and arithmetic.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \