Answer:
11. [tex]x^{-2}[/tex]
12. [tex]m^{-3}[/tex]
13. [tex](x+2y)^{-4}[/tex]
14. [tex](x+3y)^{-2}[/tex]
15. [tex](x+y)^{-3}[/tex]
16. [tex](2x+3y)^{-6}[/tex]
17. [tex](-3m-9)^{-3}[/tex]
18. [tex]x^{-4}[/tex]
Step-by-step explanation:
In all of them you just subtract the bottom exponent from the top exponent.
