Simplify the following expression to an answer with only positive exponents.
(2x^5y^7)(-5x^4z^-5) / y^12z^6

Answer:
The correct answer is (edit: b).
Step-by-step explanation:
[tex]\frac{(2x^5y^7)(-5x^4z^{-5})}{y^{12}z^6}\\\\\frac{-10x^9y^7z^{-5}}{y^{12}z^6}\\\\\frac{-10x^9}{y^5z^{11}}[/tex]