Simplify or otherwise reduce the following expression using the rules of exponents.
`(7^(6))/(7^(4))`

Simplify or otherwise reduce the following expression using the rules of exponents. 2^(-5)

Simplify or otherwise reduce the following expression using the rules of exponents. 8^(4)(5^(4))

Simplify or otherwise reduce the following expression using the rules of exponents. 2^(4)xx2^(5)div 2^(7)-2^(4)