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).
            
        Volume of a sphere (V) and radius (R).
Answers
                    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
    
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
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