(a) Write a differential formula that estimates the
change in volume of a sphere when the radius changes from
to . Enter as r0 and
as dr.
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help (formulas)

(b) Write a differential formula that estimates the change
in volume of a sphere when the radius changes from
to .
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help (formulas)

(c) Use a differential to estimate the change in volume of a melting
spherical snowball when the radius changes from to .
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