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Math Help - Algebra Summation

  1. #1
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    Unhappy Algebra Summation

    hey guys, im having a bit of trouble with some questions.
    Hopefully someone can help me out.

    1. ∑[i=1 to n]Xi

    where X = {8,10,9}

    2. ∑[i=1 to 3] (Xi + a)Yi

    Where X = {8,10,9}
    Y = { 108, 101, 103, 94}
    and a is a constant... a = 11

    Hopefully the format of the question makes to everyone, it wouldnt let me copy and paste the proper format.

    Thanks to anyone who helps!
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  2. #2
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    Re: Algebra Summation

    Quote Originally Posted by kay1740 View Post
    hey guys, im having a bit of trouble with some questions.
    Hopefully someone can help me out.

    1. ∑[i=1 to n]Xi

    where X = {8,10,9}

    2. ∑[i=1 to 3] (Xi + a)Yi

    Where X = {8,10,9}
    Y = { 108, 101, 103, 94}
    and a is a constant... a = 11

    Hopefully the format of the question makes to everyone, it wouldnt let me copy and paste the proper format.

    Thanks to anyone who helps!
    Hi kay1740,

    \sum_{i=1}^{n}X_{i}\mbox{ where }X=\{8,10,9\}

    The set X contains three elements, so you can take, X_{1}=8,~X_{2}=10\mbox{ and }X_{3}=9

    \sum_{i=1}^{3}X_{i}=X_{1}+X_{2}+X_{3}

    Hope you can continue.
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  3. #3
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    Re: Algebra Summation

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  4. #4
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    Re: Algebra Summation

    Hi Sudharaka,

    Thank you for your help!

    Is it possible that you could help me with the 2nd problem as well?
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  5. #5
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    Re: Algebra Summation

    Quote Originally Posted by kay1740 View Post
    Hi Sudharaka,

    Thank you for your help!

    Is it possible that you could help me with the 2nd problem as well?
    No, the X and Y data would have to be of the same length for us to help you with that

    CB
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  6. #6
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    Re: Algebra Summation

    No, they don't have to be of the same length - because the question puts a restriction using numbers from 1 -3. Therefore, the only #'s in the Y data that would be used are 108, 101, and 103. I'm just not sure what summation rules to apply to the question in order to get the answer.
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  7. #7
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    Re: Algebra Summation

    Quote Originally Posted by kay1740 View Post
    No, they don't have to be of the same length - because the question puts a restriction using numbers from 1 -3. Therefore, the only #'s in the Y data that would be used are 108, 101, and 103. I'm just not sure what summation rules to apply to the question in order to get the answer.
    Ok. Then the X values would be the same as we have taken previously and the corresponding Y values would be,

    Y_{1}=108,~Y_{2}=101\mbox{ and }Y_{3}=103

    Hope you can continue.
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  8. #8
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    Re: Algebra Summation

    heh alright, doesnt help too much.

    But thanks guys
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  9. #9
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    Re: Algebra Summation

    Can you explain the second question kay asked more please?
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