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5 February, 09:49

What is the 13th term in the arithmetic sequence described by this explicit formula an=84 + (n-1) (-6)

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  1. 5 February, 12:20
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    Just replace n with 13 in the formula: an=84 + (n-1) (-6)

    Thus, a (13) = 84 + (13-1) (-6) = 84 - 72 = 12 (answer)
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