# [SOLVED]3.1.008 AP calculus Exam difference in sphere volume

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#### tkhunny

##### Well-known member
MHB Math Helper
Terrible question. Maybe the best LINEAR approximation? Or words to that effect.

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

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

#### karush

##### Well-known member
it was originally from barrons but couldn't find it

Ill delete it

#### tkhunny

##### Well-known member
MHB Math Helper
Why not learn from it.

Start with $$V = \dfrac{4}{3}\pi r^{3}$$

Calculate $$\dfrac{dV}{dr}$$

Okay, so it's not a "partial" derivative.