From the problem :
[tex]6^4\times6^{-5}[/tex]
In multiplying expressions with the same bases, the exponent will be added accordingly.
For example :
[tex]a^m\times a^n=a^{m+n}[/tex]
the exponent of a are m and n, and the product will be a raised to the sum of m and n.
Applying this to the problem, we have :
[tex]6^4\times6^{-5}=6^{4-5}=6^{-1}[/tex]
The answer is d. 6^-1
