ANSWER
9
EXPLANATION
The given radical is
[tex] \sqrt[3]{729} [/tex]
We can rewrite this as
[tex] {(729)}^{ \frac{1}{3} } [/tex]
Now we need to rewrite 729 as a power with an exponent of 3.
[tex]{(9 \times 9 \times 9)}^{ \frac{1}{3} } [/tex]
[tex]{( {9}^{3} )}^{ \frac{1}{3} } = {(9)}^{3 \times \frac{1}{3} } = {9}^{1} = 9[/tex]
The third choice is correct.
