Solve the multi-variable equation

Caroline knows the height and required volume of a cone-shaped vase she's designing.  Which formula can she use to determine the radius of the vase?  Select the correct answer.

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Formula for volume of a cone is:
V = (1/3)πr²h

Solve for r.

3v = πr²h   {multiplied each side by 3}

3V
----- = r²   {divided each side by πh}
πh

{took the square root of each side, also the radius cannot be negative}


B.)  

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