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30 October, 18:31

What is the 25th term of this arithmetic sequence? 3, 9, 15, 21, 27, ...

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  1. 30 October, 18:47
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    3, 9, 15, 21, 27, ...

    +6 + 6 + 6 + 6

    a (n) = a₁ + d (n - 1)

    a (n) = 3 + 6 (n - 1)

    a (n) = 3 + 6 (n) - 6 (1)

    a (n) = 3 + 6n - 6

    a (n) = 6n + 3 - 6

    a (n) = 6n - 3

    a (n) = 6n - 3

    a (25) = 6 (25) - 3

    a (25) = 150 - 3

    a (25) = 147
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