This question is easy, i just need explanation. if x is a positive integer, which expression is equivalent to 4 sqrt x^3/5 sqrt x^2 ? assume x> 0.

It would help to have the question. But I'll guess

2nd choice.

I forgot the explanation because I was so glad to have puzzled out the question.

The fourth root is the same as the 1/4 th power.   

If we know x is positive





We multiply the powers:



The one-twentieth power is the twentieth root.  We bring the additional factor of x to the front.

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