Answer: [tex]\frac{y}{z^3}[/tex]
Step-by-step explanation:
To simplify the expression given in the problem, you must apply the proccedure shown below:
1- According the Exponents Rules, you know the following:
[tex]a^0=1\\\\a^{-n}=\frac{1}{a^n}[/tex]
2- Therefore, keeping the above on mind, you can simplify the expression given in the problem as you can see below:
[tex]x^0yz^{-3}=(1)yz^{-3}\\\\=yz^{-3}\\\\=y\frac{1}{z^3}\\\\=\frac{y}{z^3}[/tex]