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#### karush

##### Well-known member

- Jan 31, 2012

- 2,678

**not**

sorry bad post .... ignore

Last edited:

- Thread starter karush
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- Thread starter
- #1

- Jan 31, 2012

- 2,678

sorry bad post .... ignore

Last edited:

Are you studying geometry or calculus? You don't seem to have used any calculus.$$\dfrac{4}{3}\pi(3.1)^3-\dfrac{4}{3}\pi (3)^3$$

Please read up on "differential". You'll need some sort of partial derivative.

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- #3

- Jan 31, 2012

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it was originally from barrons but couldn't find it

Ill delete it

Ill delete it