Simply each expression only using. Use only positive exponents.

1.) r^5/g^-3

2.) a^2b^-7c^4/a^5b^3c^-2

3.) (2t^5)^3/4t^8t^-1

4.) (a^6/a^7)^-3

5.) (c^5c^-3/c^-4)^-2

6.) (y^-3/y^3)^2

Please help