Answer:
9⁹ ÷ 9⁶.
The expression 9³ is equivalent to 9⁹ ÷ 9⁶.
Explanation
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Using the law of exponents aⁿ÷aˣ = aⁿ⁻ˣ
9⁹÷9⁶= 9⁹⁻⁶ = 9³
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