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Math Help - Math 10- Arithmetic Series

  1. #1
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    Exclamation Math 10- Arithmetic Series

    Hello,

    My first time trying this site out-- and in desperate need of help. I'd like not for the answer to be provided but just which formulas to use

    Q: Consider the series defined by Sn= 3n *2- n
    a) Find the first four terms of the series
    b) Determine the eighth term of the corresponding sequence.


    *meant to be n squared
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Judy View Post
    Hello,

    My first time trying this site out-- and in desperate need of help. I'd like not for the answer to be provided but just which formulas to use

    Q: Consider the series defined by Sn= 3n *2- n
    a) Find the first four terms of the series
    what problem are you having with this question exactly? the first four terms of the series are S_1, S_2,S_3 \mbox { and } S_4

    so for the first term, you plug in n = 1 into the formula above, for the second plug in n = 2, etc

    b) Determine the eighth term of the corresponding sequence.
    now this one is a little harder, but the answer to the last question helps us out. The first term of the corresponding sequence is S_1, the second term is S_2 - S_1, the third term is S_3 - S_2 and so on.

    questions: why is that? do you know the difference between a sequence and a series? can you do the question now that you know all this information?

    *meant to be n squared
    if you can't use LaTex, use "^" to represent powers. so you would type S_N = 3n^2 - n
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  3. #3
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    Hi, Thank You! For the first question I guess i was over complicating it, I figured there had to be more involved. Thx again and for the ^tip!
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Judy View Post
    Hi, Thank You! For the first question I guess i was over complicating it, I figured there had to be more involved. Thx again and for the ^tip!
    what about the second question?
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