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djtwinx017
The correct answer is a = 3

Since 81r^24 = (ar^b)^4
That means that a^4 = 81.

Since the √81 = 9, and the √9 = 3, then:

multiplying 3 * 3 * 3 * 3 = 81 is the same as 3^4 = 81.

Therefore, a = 3

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