anonymous
  • anonymous
Summations
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1439771942859:dw|
tkhunny
  • tkhunny
What do you think and how are you producing results?
anonymous
  • anonymous
sn=a1-1rn/1-r sn=20-20(0.5)^12/1-0.5

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anonymous
  • anonymous
I got 39.98 but I think that's wrong?
tkhunny
  • tkhunny
Not bad, excepting notation... sn=(a1-a1r^n)/(1-r) sn=(20-20(0.5)^12)/(1-0.5 ) All those extra parentheses are not optional. Good work. Did you manage really close to 10?
anonymous
  • anonymous
No. I got 39.98 for some reason
tkhunny
  • tkhunny
Use n = 3 and recalculate the first value, a1.
anonymous
  • anonymous
ok, so I guess it would be 9.99?
tkhunny
  • tkhunny
There you go.

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