Algebra 2 homework help!!!!!?

[baller722]

Can u simplify the following:

1.) (root 4 of 81y^5) / (root 4 of x^4y

2.) (4+root 3) * (-2+root 2)

3.) (7 root 20) + (8 root 5) - (2 root 45)

Make the following have a rational denominator:
4.) 3 / root 15

5.) (5-5 root 6) / (7- root 12)

6.) 14 / (root 5) + (root 3)

7.) (2 root 5) - (root 3) / (root 5) + (root 3)

Thats it!!

Thank you, and if you dont want to answer all, then answer only some, but whoever answers the most gets most points!!!!!