If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate at which the diameter decreases when the diameter is 12 cm.

Question

anonymous · Answer

I keep getting -5/24pi but it says its wrong

radar · Answer

Surface area of a snowball is 
SA=Pi*D^2   is the equation you used?

radar · Answer

Maybe since it asks for the decrease using a negative answer is suggesting an increase....just sayin...

anonymous · Answer

wow u were right thanks!

radar · Answer

Glad to help, sometimes it is difficult to understand what they are asking....that is the fun of it.  Good luck with related rates (I never had too much luck with them lol).

anonymous · Answer

yeah theyre killing me at the moment -_-