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1 November, 05:19

Find the 25th term of the arithmetic sequence when a1 = - 14 and d = - 5

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  1. 1 November, 09:14
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    a25 = - 134

    Step-by-step explanation:

    For first term a1 and common difference d, the formula for the n-th term is ...

    an = a1 + d (n - 1)

    You want to evaluate this for n=25, a1=-14, d=-5. Filling in the numbers and doing the arithmetic, you get ...

    a25 = - 14 - 5 (25 - 1) = - 14 - 120

    a25 = - 134
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