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 Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
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 find a sum using sigma notation- MATH HELP 
#160569 - 12/11/08 12:23 PM (16 years, 2 months ago) |
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alright, I need some math help if there is anyone out there willing to throw me a bone here
30
E (5k+3)
k=1
The "E" is the Sigma sign. I need to find the sum of terms 1-30.
I know the long method but I know there is a short way to solve this problem, any help is greatly appreciated
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Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
#160723 - 12/11/08 06:45 PM (16 years, 2 months ago) |
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bump, no one?
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Coaster
I'm Back Baby
Registered: 04/23/08
Posts: 25,306
Loc: Sativa Central 
Last seen: 13 years, 9 months
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
#160731 - 12/11/08 06:56 PM (16 years, 2 months ago) |
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lol no1 is gonna help u
and i would if u werent such a dick 2 me
such an ez problem 
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 Ombient
ɥɐɹq ɹǝqos
Registered: 04/20/08
Posts: 3,499
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
#160734 - 12/11/08 06:59 PM (16 years, 2 months ago) |
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the right equations you need should all be in your book. find out if its geometric or arithmetic, I guess right? then plug into the correct equation for sum of terms. 
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Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
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Re: find a sum using sigma notation- MATH HELP [Re: Ombient]
#160743 - 12/11/08 07:27 PM (16 years, 2 months ago) |
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Quote:
Omni said:
the right equations you need should all be in your book. find out if its geometric or arithmetic, I guess right? then plug into the correct equation for sum of terms.
I dont have a math book 
But fine, I will spend the next hour trying to do this problem. I got nothing but time on my hands
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Coaster
I'm Back Baby
Registered: 04/23/08
Posts: 25,306
Loc: Sativa Central
Last seen: 13 years, 9 months
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
#160744 - 12/11/08 07:45 PM (16 years, 2 months ago) |
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my hands smell like kush n pussy
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Ombient
ɥɐɹq ɹǝqos
Registered: 04/20/08
Posts: 3,499
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
#160750 - 12/11/08 08:00 PM (16 years, 2 months ago) |
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its arithmetic (diff of +5)...eq's for arithmetic sequences:
eq. to find whatever term
"where a1 is the first term of the sequence,
d is the common difference, n is the number of the term to find."
eq for sum of certain number of terms
"where Sn is the sum of n terms (nth partial sum),
a1 is the first term, an is the nth term."
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Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
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Re: find a sum using sigma notation- MATH HELP [Re: Ombient]
#160752 - 12/11/08 08:05 PM (16 years, 2 months ago) |
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Thank you, I know that first formula pretty well, but dont think I have used the 2nd one before
Thanks!
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