anonymous
  • anonymous
Graph the six terms of a finite series where a1 = −3 and r = 1.5.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
http://assets.openstudy.com/updates/attachments/535c28dee4b09663a63dcaa3-gabylovesu-1398548726373-screenshot20140426at5.27.46pm.png http://assets.openstudy.com/updates/attachments/535c28dee4b09663a63dcaa3-gabylovesu-1398548726013-screenshot20140426at5.27.53pm.png
anonymous
  • anonymous
@mathstudent55
welshfella
  • welshfella
sum of n terms = a1 (r^n - 1) ------ r - 1

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anonymous
  • anonymous
Yes :)
anonymous
  • anonymous
-3.5(1.5-1)/1.5-1 ?
welshfella
  • welshfella
-3 * (1.5^6 - 1) ---------- 1.5 - 1
anonymous
  • anonymous
I got 62.34???
welshfella
  • welshfella
oh thats the sum of 6 terms sorry I misread the question
anonymous
  • anonymous
It's fine :)
welshfella
  • welshfella
its -62.34
welshfella
  • welshfella
the terms in sequence are -3 , -3*1.5 , -3*1.5^2 , -3*1.5^3 ... = -3 , -4.5 , -6.75 , - 10.125 ....
anonymous
  • anonymous
I see, so then I would just look for a graph that showed that?
welshfella
  • welshfella
yes
anonymous
  • anonymous
C?
anonymous
  • anonymous
i have a feeling I'm wrong haha! So I'm going to go with D
welshfella
  • welshfella
D is correct
welshfella
  • welshfella
first 3 points are (1,-3), (2, -7.5) , (3, -14.25
welshfella
  • welshfella
the y values are accumulated
welshfella
  • welshfella
- so , for example, the second y value is -3 - 4.5 = -7.5
anonymous
  • anonymous
Ohh! I understand now:) Thanks so much for your help!
welshfella
  • welshfella
yw

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