SOLUTION: how do i do this? simplify(all positive exponents) {{{(r^-3s^2t^-4)/(r^0s^-4t^-5)}}}

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Question 134142: how do i do this?
simplify(all positive exponents)
%28r%5E-3s%5E2t%5E-4%29%2F%28r%5E0s%5E-4t%5E-5%29
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify:
%28r%5E%28-3%29s%5E2t%5E%28-4%29%29%2F%28r%5E0s%5E%28-4%29t%5E%28-5%29%29 To change the sign of the exponent, move the base and its exponent down (if it is up) or up (if it is down).
%28s%5E2s%5E4t%5E5%29%2F%28r%5E0r%5E3t%5E4%29 Combine the like-bases by adding/subtracting their exponents and recall that x%5E0+=+1
%28s%5E6t%29%2F%28r%5E3%29