algebra

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The second term of an arithmetic sequence is 24 and the fifth term is 3.Find the first term and the common difference.

  • algebra -

    Use your formulas.

    a+d = 24
    a+4d = 3
    subtract them:
    3c = -21
    d = -7

    in a+d=24
    a=7=24
    a = 31

    first term is 31, common difference is -7

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