Using only positive exponents 10pt for best answr?

Question

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Answer 1

xy^-1z^2

Answer 2

z²/x³

Answer 3

Take your x^-2 and drop it into the denominator: anytime you have a negative exponent, put it on the other side of the fraction line (that is, move it from the numerator to the denominator, or from the denominator to the numerator) to make it a positive exponent.

So that gives us (y^0 * z^2) / (x^2 * x * y).

But this can be simplified further: anything raised to the zero power is simply 1, so we can ignore that y^0 entirely, since it is being multiplied (1 multiplied by anything gives us the anything).  

Which gives us (z^2) / (x^2 * x * y).

Now we can combine the x^2 and the x.

So we have it as simple as it can get, (z^2) / (x^3 * y).

Answer 4

multiplying the whole equation by x^2 you get    (y^0)(z^2)/(x^3)(y)

(y^0) becomes 1 as anything to 1st power is 1    (z^2)/(x^3)(y)

your answers is          

    z^2

                               ------------------

                                    (x^3)(y)