anonymous
  • anonymous
Find the sum of the given arithmetic series. 27 + 20 + 13 + 6 + ... + (–36)
Mathematics
jamiebookeater
  • jamiebookeater
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Compassionate
  • Compassionate
It's decreasing by seven each time. That is: 27+ 20+ 13+ 6 - 1 - 8 - 15 - 22 - 29 - 36 This simplifies too: 66 - 111
Compassionate
  • Compassionate
The "... +(-36) Means we're only going to -36, once we get there we stop.
Compassionate
  • Compassionate
Can you do the last part by yourself?

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Kaederfds
  • Kaederfds
10/2 x (27-36) = 5.(-9) = -45
Compassionate
  • Compassionate
Kae, don't give out the answer.
anonymous
  • anonymous
pshhhh thankss :)

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