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Math Help - consider the sequence given by

  1. #1
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    consider the sequence given by

    U1 =3.9, Un+1 = Un - 1.7 (n= 1,2,3,....).

    i) state what type of sequence this is.
    ii) write down the first four terms of the sequnce.
    iii) find a closed form for the sequence.
    iv) use the closed form from iii) to find the value of n when Un = - 76.
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  2. #2
    Senior Member
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    U[n]=3.9-(n-1)\cdot 1.7
    The sequence is strictly monotone decreasing. Using the closed formula you can answer to question ii) and iv).
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  3. #3
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    please help guys i have put that this is arithmetic sequence and am struggling to work out the first four terms and the closed sequence
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