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25 March, 06:39

What is the equation used to find the nth term of the arithmetic sequence: - 9, - 4 1, 6, 11 ...

a^n = -9-5n

a^n = 5-9 (n-1)

a^n = -9 + (n-1) ⋅5

a^n=-9 (5) ^ (n-1)

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  1. 25 March, 06:53
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    a^n=-9 + (n-1).5

    Step-by-step explanation:

    Arithmetic sequence=a + (n-1) d

    a=-9

    n=?

    d=+5

    Arithmetic sequence=-9 + (n-1) 5

    =-9+5n-5

    Collect like terms

    -9-5+5n

    -14+5n

    So the final answer is

    an=-9 + (n-1).5
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