Answer:
5m^5n^4
Explanation:
Divide the length (5m^4n^2) into the area (25m^9n^6) to obtain the width:
25m^9n^6
----------------- = 5 m^(9-4)n(6-2) = 5 m^5n^4
5 m^4n^2
The width of the rectangle is 5m^5n^4.
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