[Answer] 1. The common difference -- that is, one term minus the preceding term -- in an arithmetic sequence doesn't have to be positive. For example, what is the common difference in the following arithmetic sequence? 98, 89, 80, 71, ...

Step 1 : Introduction to the question "1. The common difference -- that is, one term minus the preceding term -- in an arithmetic sequence doesn't have to be positive. For example, what is the common difference in the following arithmetic sequence? 98, 89, 80, 71, ... "

...1. -9 2. -10 3. 9 4. 10 To get the next term in the sequence, subtract 9 from the previous term.

Step 2 : Answer to the question "1. The common difference -- that is, one term minus the preceding term -- in an arithmetic sequence doesn't have to be positive. For example, what is the common difference in the following arithmetic sequence? 98, 89, 80, 71, ... "

-9:

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