IT looks like the operations is "add 4 subtract 3, add 5 subtract 2, add 6...". So the next step would be to subtract one. That would make the next number 11.
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Any arithmetic operation, other than division by zero, can be performed on any set of numbers in a sequence.
In order to determine whether or not this is an arithmetic sequence, there must be at least 3 numbers.
Put n = 1, 2, 3, 4 etc in the expression 5n + 2 and evaluate to get the sequence.
The sequence of (3n) represents a series of numbers generated by multiplying the integer (n) by 3. Specifically, for (n = 0, 1, 2, 3, \ldots), the sequence is (0, 3, 6, 9, 12, \ldots). This is an arithmetic sequence where each term increases by 3, starting from 0. The general term can be expressed as (3n) for (n = 0, 1, 2, \ldots).
-1 deduct 3 each time