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Asked by Jesvlyn Garcia

Determine if two variables are directly proportional. if so, write the equation of variation.

Volume of a sphere (V) and radius (R).
4 years ago

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Answered by oobleck
v is proportional to r is
v = kr
Since v = 4/3 πr^3, v is proportional to r^3, but not r.

Easy to check:
v(1) = 4π/3
v(2) = 32π/3
v(2)/v(1) = 32/4 ≠ 2/1
4 years ago

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