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1. Tell whether the sequence 5, 9, 13, 17, ... is either arithmetic or not. If it is arithmetic, identify the common difference. 2. What are the next three terms of the arithmetic sequence 15, 23, 31, 39, ...? 3. The first term of the arithmetic sequence is 13 and the common difference is 7. What are the first five terms of the sequence? 4. The common difference of an arithmetic sequence is 8 and the first term is 6. What are the first five terms of the sequence? 5. In the arithmetic sequence 4, 12, 20, ... what is the 47th term?​