Easy# Related Rate: Volume of a Balloon

APCALC-S1BXUL

The radius of a spherical balloon is decreasing at the rate of $0.3\text{ inch/s}$. The rate of change of volume (given in $\text{inch}^3/\text{ second}$) when radius of the balloon is $4\text{ inches}$ is approximately:

$$V=\frac{4}{3}\pi r^3$$