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What is the explicit rule for the arithmetic sequence?

17.5, 14, 10.5, 7, 3.5, ...
an = 21 + 3.5n
an = 17.5 + 3.5n
an = 21 - 3.5n
an = 17.5 - 3.5n

User Shamica
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1 Answer

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Answer: an = 21 - 3.5n

Explanation:

21 - 3.5 = 17.5

17.5 - 3.5 = 14

14 - 2.5 = 10.5

etc

User Plaban
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