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anonymous

  • one year ago

Help please??? Find S5 for the series -2 + -10 + -50 + -250 +...

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  1. anonymous
    • one year ago
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    what's the r?

  2. anonymous
    • one year ago
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    I think its 5?

  3. anonymous
    • one year ago
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    yes it is 5. you have the first 4 terms. What's the 5th?

  4. anonymous
    • one year ago
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    -1250?

  5. anonymous
    • one year ago
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    right. S5 is the first 5 terms added together

  6. anonymous
    • one year ago
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    so is -1250 the answer? if not could you explain how to get it?

  7. anonymous
    • one year ago
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    -1250 is the first term. S5 means the sum of the first 5 terms, so S5 = -2 + -10 + -50 + -250 + -1250

  8. anonymous
    • one year ago
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    so I just need to add them together?

  9. anonymous
    • one year ago
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    yes

  10. anonymous
    • one year ago
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    okay I got -1562. Is that right?

  11. anonymous
    • one year ago
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    yes

  12. anonymous
    • one year ago
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    Thank you <3

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spraguer (Moderator)
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