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anonymous

  • one year ago

Find the sum of the first 9 terms of the sequence. Show all work for full credit. 2, -7, -16, -25, ...

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  1. welshfella
    • one year ago
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    this is an arithmetic series with common difference -9

  2. anonymous
    • one year ago
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    im really confused on how to solve it

  3. welshfella
    • one year ago
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    Sn = (n/2)[2a1 + (n -1)d] where a1 = first rems, n = number of terms and d = common difference

  4. welshfella
    • one year ago
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    Sn is sum of n terms , here n = 9

  5. welshfella
    • one year ago
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    just plug the values into the formula

  6. anonymous
    • one year ago
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    oh ok thanks. i understand

  7. welshfella
    • one year ago
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    yw

  8. welshfella
    • one year ago
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    your answer is approximately -300

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