Question 679294
V=4/3 pi r^3
Solve formula for r 
{{{4/3}}}*{{{pi*r^3}}} = V
multiply both sides by 3
{{{4*pi*r^3}}} = 3V
divide both sides by 4pi
{{{r^3)}}} = {{{(3V)/(4*pi)}}}
the cube root of both sides
r = {{{((3V)/(4*pi))^(1/3)}}}