5^-5/5^8

To simplify the expression 5^(-5) / 5^8, we can use the rule of exponents which states that when dividing two exponents with the same base, you subtract the exponents.

So, applying this rule, we get:

5^(-5) / 5^8 = 5^(-5-8)

= 5^-13

Therefore, 5^(-5) / 5^8 is equal to 5^-13.