I need help with simplifying?

Question

How are these problems solved? I've asked my teacher and looked online but I can't figure it out.

1. [(x^6y^5)/(4x^7)]^7[(3x^5)/(8y^2)]^-8[(6...

2. (x^7x+8 x^2x-4)/(x^3x-7)

Solve for n.

3.8^2n-5 (8^5n+4)^-4 =(8^3-6n)^7

Answer 1

try this site it's help

http://math.about.com/

Answer 2

Rather than tell you the answers, which would not benefit you, I found a website that describes how to complete these problems in detail.

http://www.sosmath.com/algebra/logs/log4...