Question 277301
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First thing.  The volume is not 91 or any other number of inches.  It certainly could be 91 cubic inches, but that is not what you said.  


The volume of a cylinder is given by:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ V\ =\ \pi r^2h]


but you want the height when you know the radius and volume, so divide by *[tex \Large \pi r^2]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ h\ =\ \frac{V}{\pi r^2}]


Now all you need to do is plug in the numbers you are given for volume and radius and do the arithmetic.  Leave the answer in terms of *[tex \Large \pi] if you want an exact answer, or use 3.14 for a close enough numerical approximation.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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