Air is let out of a spherical balloon at a rate of 300 cm^3 s^-1.
So we want a formula for the volume of a sphere:
Substitute -300 for and simplify
Find the rate at which the radius is
decreasing when
a) the radius is 2 cm,
Substitute 2 for r in the last equation and solve
for
b) the volume is 367pi cm^3
Substitute for in ,
Solve for
Substitute that value for r in
Solve for
Edwin
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