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Answer:
The given sequence is: 3, 9, 27, 81, ...
We can see that each number is multiplied by 3 to get the next number.
The first term (n=1) is 3, which is 3^1.
The second term (n=2) is 9, which is 3^2.
The third term (n=3) is 27, which is 3^3.
The fourth term (n=4) is 81, which is 3^4.
We can see a pattern: the nth term is 3 raised to the power of n.
The expression for the nth term is: 3^n
So, the nth term of the sequence 3, 9, 27, 81, ... is