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Math Help - Arithmetic Series/Sequence merger

  1. #1
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    Arithmetic Series/Sequence merger

    Im not quite sure how to do this.. I am instructed to find the value of the 11th term of an arithmetic sequence where t1=-13 and the sum of the first 1 terms is -33. Now I thought I could use the equation -33= (-13+tn/2)11
    but that is either not the right approach or I am simplifying it wrong(both likely). Any help is very appreaciated
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  2. #2
    MHF Contributor red_dog's Avatar
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    S_{11}=\frac{(t_1+t_{11})11}{2}

    Then -33=\frac{(-13+t_{11})11}{2}

    Now find t_{11}
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