Mathematics 15 Online
OpenStudy (anonymous):

What is the rate of change of the volume of a sphere with respect to the radius when the radius is r = 2 in.?

hero (hero):

$V_{sphere} = \frac{4\pi r^3}{3}$

hero (hero):

$V Prime = 4\pi r^2$

hero (hero):

V Prime = rate of change of sphere

hero (hero):

substitute 2 = r for radius, then evaluate

hero (hero):

OpenStudy (anonymous):

How did you get V prime? Find the derivative?

hero (hero):

Yes

OpenStudy (anonymous):

Ok, so when finding the derivative, I would plug (x+h) into r?

hero (hero):

Oh you haven't learned the shortcut for taking derivative?

OpenStudy (anonymous):

No, not yet.. our teacher is making us do the definition of a derivative.

hero (hero):

I'm sorry to hear that

OpenStudy (anonymous):

Lol, it's okay, in this case I would put (x+h) into r then, right?

hero (hero):

Um, well....hold on

hero (hero):

Good luck with using definition of derivative to do this. Your teacher should have shown you how to do it by now.

OpenStudy (anonymous):

LOL okay.. thanks though =]

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