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anonymous

  • 5 years ago

Write out the first three terms and the last term of ∑(-2i+6) (on top of the sigma sign is 40 and on the bottom i=1) . Use the formula for the sum of the first n terms of an arithmetic sequence find the sum.

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  1. anonymous
    • 5 years ago
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    \[\sum_{i=1}^{40}(-2i+6)\]?

  2. anonymous
    • 5 years ago
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    yes thats how the equation looks

  3. anonymous
    • 5 years ago
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    first three term (-2(1)+6)+(-2(2)+6)+(-2(3)+6)

  4. anonymous
    • 5 years ago
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    last three term same thing start from 38, 39,40

  5. anonymous
    • 5 years ago
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    thank you I really appreciate the help

  6. anonymous
    • 5 years ago
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    Do you need help with arithemtic sum? Also if I helped you some way, please fan me

  7. anonymous
    • 5 years ago
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    I understand arithmetic sum now thanks to you help but I do need help with another problem.

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spraguer (Moderator)
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