Function notation in context example | Functions and their graphs | Algebra II | Khan Academy

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[benji.]

"3 inches not to big" That hurt

[JonEffinZoidberg]

Great video & thanks... I did it your way and came up with the same answer. But I thought you had to multiply by the denominator to get rid of the fractions... Is it because there wasn't anything on the other side of the equation? Or when is it ok to divide by the denominator like you did there turning the 27 into a 3? 

I multiplied & still came out with 36pi so I'm assuming you were right (especially since you're the video creator and I"m the one trying to learn, I've done this all before up to pre-calc but been over 10 years so trying to refresh myself and want to make sure I understand exactly why something is happening rather than just doing it because it's the way to do it).

Thanks again for the video and thank you even more for the Academy. It's a great gift to humanity.