A sphere's volume is V=43πr3V = \frac{4}{3}\pi r^3V=34πr3. If the volume is 36π36\pi36π, what is the radius rrr?
r=3r = 3r=3
r=273r = \sqrt[3]{27}r=327
r=2r = 2r=2
r=9r = 9r=9