Step-by-step explanation:
Well if you dont understand something ask a teacher for help or study on a topic that you struggle with for example math try looking up different math questions and solving them or ask a teacher is you can have pratice questions or problems then show it to him/her so they can check to see if you are right. Hope that help unless you dont understand a certain question that I might have missed.
The answer to the question is D
8.-12y^10 9.-15z^17 10.a^3b^3/125 11. 9x^2y^6/z^4
