Problem:

xy^2/ z^4

I don't see how the problem can be simplified further--there are no neg exponents in it. The book says the answer is: xy^2z^4 but I don't see how you can just move the z^4 to the top. The only other choice that makes sense is xy^2z^-4 but this seems more complicated with the negative z exponent on the top. i thought that simplifying means to get rid of the negative exponents. I have tried plugging in the #2 for all variables and still get the same answer which the book says is wrong (I'm hoping it's a typo)

thanks, carol