



 
Hi Isaebl, The exponential notation for $\sqrt{13}$ is $13^{1/2}$ and the notation for the cube root of 13 is $\sqrt[3]{13}$ or $13^{1/3}.$ In fact for any positive integer $n$ the $n^{th}$ root of 13 is $\sqrt[n]{13}$ or $13^{1/n}.$ I hope this helps, 



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