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anonymous

  • one year ago

Find the sum of the summation of 2 i minus 9, from i equals 3 to 10.

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  1. anonymous
    • one year ago
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    \[\sum_{3}^{10}2i-9\]?

  2. anonymous
    • one year ago
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    yes, except at the bottom of that E thing, its i=3

  3. anonymous
    • one year ago
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    got it a few steps are needed ready?

  4. anonymous
    • one year ago
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    yes

  5. anonymous
    • one year ago
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    first replace \(i\) by \(3\) in \(2i-9\) what do you get ?

  6. anonymous
    • one year ago
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    -3?

  7. anonymous
    • one year ago
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    lol yeah \(-3\)!!

  8. anonymous
    • one year ago
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    now hold on to that number for a sec replace \(i\) by \(10\) in \(2i-9\) what do you gte ?

  9. anonymous
    • one year ago
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    11

  10. anonymous
    • one year ago
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    ok now add those two numbers

  11. anonymous
    • one year ago
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    8?

  12. anonymous
    • one year ago
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    yup now divide that by 2

  13. anonymous
    • one year ago
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    4

  14. anonymous
    • one year ago
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    one more step

  15. anonymous
    • one year ago
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    which might be a little confusing you actually have 8 terms to add up \(10-3+1=8\) take your 4 and multiply it by 8

  16. anonymous
    • one year ago
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    32

  17. anonymous
    • one year ago
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    and that is your final answer

  18. anonymous
    • one year ago
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    want to check it?

  19. anonymous
    • one year ago
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    I turned in the test. It was right. Thank you so much!

  20. anonymous
    • one year ago
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    you are quite welcome

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spraguer (Moderator)
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