well, the volume went from
4pi/3 * 10^3 = 4000pi/3
to
4pi/3 * 20^3 = 32000pi/3
Assuming you can evaluate those expressions, you should be able to answer the question
To the nearest tenth of a cubic inch, how much volume is added to a spherical balloon whose radius grows from 10 to 20 inches long?
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