Which formula can be used to describe the sequence below 27,9,3

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Step-by-step explanation:

This is a geometric sequence that means there is a common ratio.  That means there is a number you can multiply over and over to get the next term.

The first term is 27.

The second term is (1/3)(27)=9.

The third term is (1/3)(9)=3.

So the common ratio is 1/3.

That means you can keep multiplying by 1/3 to find the next term in the sequence.

The explicit form for a geometric sequence is where is the first term and is the common ratio.

We are given and .

So the explicit form for the given sequence is .

answer: 45