anonymous
  • anonymous
Find the sum of the first 12 terms of the sequence. 1, -4, -9, -14, . . .
Mathematics
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anonymous
  • anonymous
Find the sum of the first 12 terms of the sequence. 1, -4, -9, -14, . . .
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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YoloShroom
  • YoloShroom
alright so, first we have to figure out the sequence, what do you think it is so far? Hint : 1 + x = -4 , -4 + x = -9 ....
anonymous
  • anonymous
-9+x=-14?
anonymous
  • anonymous
so -5

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YoloShroom
  • YoloShroom
Yup! so now that we know how to fnd the next numbers in the sequence we can proceed to find all 12 terms, and add them up
YoloShroom
  • YoloShroom
What did you get? :)
anonymous
  • anonymous
is it -338?
YoloShroom
  • YoloShroom
1+(-4)-9-14-19-24-29-34-39-44-49-54 = = -319 i believe. Let me double check my work :)
YoloShroom
  • YoloShroom
I believe it's -319, mind showing me what you did?
anonymous
  • anonymous
1,-4,-9,-14,-19,-24,-29,-34,-39,-44,-59,-64 , my bad i accidently typed in this i didnt do 54
YoloShroom
  • YoloShroom
alright, but you understand it right? :) cuz if u need clarification i can easily help you put with that

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