Answer: 12ab^3
Explanation:
The length of the rectangle will be gotten by dividing the area by the width. This will be:
Length = 72 a^3b^4 / 6a^2 b
= 72 × a × a × a × b × b × b × b / 6 × a × a × b
= 12 × a × b × b × b
= 12ab^3
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