Type of Sequence Arithmetic sequence. Common Difference: -0.5
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When a sequence is arithmetic, the difference between two consecutive terms is constant. By examining our sequence we can see that this is the case.
15 +( - 0.5) ⟶ 14.5 +( - 0.5) ⟶ 14 +( - 0.5) ⟶ 13.5 +( - 0.5) ⟶ 13
Therefore, the sequence is an arithmetic sequence with common difference - 0.5.