Further maths

The 8th term of a linear sequence is 18th and the 12th term is 26th .find the first term,common difference and the 20th term

asked by Zainab
  1. Your question does not make sense
    "The 8th term of a linear sequence is 18th"
    = gobbledegoop!
    In any arithmetic (linear) sequence, the terms either increase or decrease. A term can never repeat itself
    if you meant:
    The 8th term of a linear sequence is 18 , we can do something

    Correct your question, and we'll go from there.

    posted by Reiny
  2. a+7d = 18
    a+11d = 26
    subtract them:
    4d = 8
    d = 2

    in a+7d = 18
    2+7d = 18

    carry on

    posted by Reiny

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