Answer:
7. k^4
8. m^6
9. 18x^4
10. 35u^8v^4
11. 6561
12. x^6 y^24
13. 16a^6 b^11 c^2
14. -8f^5 g^6 h^5
15. 81p^9 t^10
Step-by-step explanation:
4/9-1/6=5/18