Think about making ones and where any left over factors would remain.

$$ \frac{ 2 }{x^{4} } $$

How many factors of s are multiplied?
How many of $t$?
How many of $u$?

$s^{11}u^{2}$

Write $3w^{-2}$ multiplied four times then follow the same pattern as seen in part (b).

$\frac{ 81 }{w^{8} }$

Move the exponent and its base into the denominator
of a fraction to make the exponent positive.

$\frac{ 1 }{m^{3} }$