Answer: D. -1
Explanation:
Your equation:
>We are going to work from the inside first then out
The cube root of 64 is 4 because 4*4*4=64
> 4² = 4*4=16
> the 4th root of 16 is 2 because 2*2*2*2=16
> if you have the same bases you can set the
exponents equal. They are not the same but we
are going to make them the same.
> 2 is the same as 2^1, i can make the bases the
same if I can make the 2 a reciprocal. That
happens when I take the negative exponent of the
number
>Now that my bases are the same, I can make the
exponents =
-1 = x