Answer:
-18432
Hey! I got this Answer STRAIGHT OFF OF DeLTA MATH! This answer is correct because it states it is. I think we can trust a Math software more then just some rando dude on the internet! I hope this helped! Also I noticed people put answers online but purposefully make it wrong. Like the answer is 24 but they purposefully put -24. Just a random fact! Anyways hope this helped! Put the heart and your rating on this answer to help other people find it! Let me know if this worked! Bye my loves!
18432
Explanation:
The first term is 9 and the common ratio is -18 / 9 = 2, therefore the explicit formula is aₙ = 9 * 2⁽ⁿ⁻¹⁾. Therefore, a₁₂ = 9 * 2¹¹ = 18432.
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