7
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The cube root of 8 is 2, and the cube root of 343 is 7. Therefore, the cube root of 8 over 343 is 2 over 7.
It is -7
If, by "third square root" you mean cube root, the answer is 7.
56
not a whole number. 6 is 216, and 7 is 343 the cube root of 333 is 6.93