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What is a descending arithmetic sequence?
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It's a sequence of numbers that go down in a regular, linear fashion.

Explanation:
An example is $10,9,8,7, \ldots$ that goes down 1 every step or step $=-1$.
But $1000,950,900,850 \ldots$ would also be one, because this goes down 50 every step, or step $=-50$.
These steps are called the 'common difference'.

Rule:
An arithmetic sequence has a constant difference between two steps. This can be positive, or (in your case) negative.

by Diamond (55,153 points)

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