Remember that to reduce fractional exponents, subtract the numerator from the denominator

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

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

$(s^{4}\cdot s^{7})(t\cdot t^{-1})(u^{2}) = S^{11}U^{2$

Write (3w⁻²) four times and multiply them together following the same pattern as seen in part B.

$\frac{81}{W^2}$

The square root of a number is the same as raising it to the 1/2 power

When you are multiplying two exponents together you add them.