Arthur D. answered 11/24/16
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(16)^(1/3)/(9)^(1/3)
(16)^(1/3)=(8*2)^(1/3)=(8)^(1/3)*(2)^(1/3)=2[(2)^(1/3)]
2[(2)^(1/3)]/(9)^(1/3)
2[(2/9)^(1/3)]