college algebra

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find a general term for the sequence

a1,a2,a3,a4.....
15,23,31,39

  • college algebra -

    notice that they increase by 8
    so
    t(n) = 8n + b
    when n=1 we want that to be 15
    15 = 8+b
    b = 7

    term(n) = 8n + 7

    check :
    t(4) = 8(4) + 7 = 39 , looks good!

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