Can anyone help me? Look at the pic!

Answer:
[tex]\frac{x^3}{y^7}[/tex]
Step-by-step explanation:
Negative exponents are rewritten as:
[tex]x^{-n}=\frac{1}{x^n}[/tex]
Therefore:
[tex]x^3y^{-7}=\frac{x^3}{y^7}[/tex]
I thinks the first multiple choices, look...the one that different other than choices.
Hope it helps, thanks!