(s^3z/hc^2)^-4

To simplify the expression ((s^3z)/(hc^2))^-4, you can apply the exponent -4 to both the numerator and the denominator.

So, ((s^3z)/(hc^2))^-4 = (s^-12z^-4)/(h^-4c^-8).

Now, to simplify it further, you can apply the negative exponent by moving the variable with the negative exponent to the opposite side of the fraction and changing the sign of the exponent:

(s^-12z^-4)/(h^-4c^-8) = (h^4c^8)/(s^12z^4).

Therefore, the simplified expression is (h^4c^8)/(s^12z^4).