Find a formula for the nth term of the sequence. 1. 64, 32, 16, . . .

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Find a formula for the nth term of the sequence.
1. 64, 32, 16, . . .
2. 81, 27, 9, . . .
3. 9, 18, 36, . . .
4. 5, -10, 20, . . .
5. 6, - 9, 27 / 2, . . .
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