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## Homework Statement

the volume v=(4/3)(pie symbol 3.14..)r of a spherical balloon changes with the radius

a)at what rate does the volume change with respect to radius when r= 2ft?

b) by approximately how much does the volume increase when the radius changes from 2 to 2.2ft?

## Homework Equations

v=(4/3)(pie symbol 3.14..)r

sorry, couldn't find the pie symbol to multiply the r with in this equation

## The Attempt at a Solution

for part a i tried to plug in 2 or the r in the equation and then divide by 2for part b i tried subtracting the equation when r is substituted for 2 from when the r is substituted for 2.2