Question 389444
Raising something to a negative power is the same as dividing it by the positive power. So, w^-4 is the same as 1/(w^4)

So,

{{{(w^-4)/(w^6)}}}

is the same as 
{{{1 / (w^4) * 1 / (w^6) }}}

To determine the denominator, we multiply w^4 by w^6 by
adding the powers together. So the answer is:
{{{1/w^10}}}
Or equally:
{{{w^-10}}}