One of the infinitely many possible rules for the nth term of the sequence is
t(n) = 4n - 1
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The nth term in the sequence -5, -7, -9, -11, -13 can be represented by the formula a_n = -2n - 3, where n is the position of the term in the sequence. In this case, the common difference between each term is -2, indicating a linear sequence. By substituting the position n into the formula, you can find the value of the nth term in the sequence.
Double it minus the previous number.
If you mean: 15 11 7 3 then the nth term is 19-4n
The simplest, out of infinitely many possible answers, is the linear polynomial,U(n) = 4n - 1 for n = 1, 2, 3, ...
If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19