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The answer depends on what information you have.
If you know the first number, a, and the common difference d, (where d is negative), then the nth term is
a + (n - 1)*d : exactly the same as in an increasing linear sequence. The only difference is that d is negative instead of positive.
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How do you find the nth term of a nonlinear sequence?
If the sequence is non-linear, you need to establish how it is defined.
How do you find the nth term of a declining sequence?
It depends on how the sequence is defined. Whether it is increasing, decreasing, oscillating or whatever is not relevant.
How do you work out the first term in a linear sequence?
no
What sequence is formed by subtracting each term of a sequence from the next term?
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
What the nth term in the sequence-5 -7 -9 -11 -13?
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.
