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Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
find a sum using sigma notation- MATH HELP
#160569 - 12/11/08 12:23 PM (16 years, 2 months ago )
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
Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
Re: find a sum using sigma notation- MATH HELP [Re: Picklez ]
#160723 - 12/11/08 06:45 PM (16 years, 2 months ago )
bump, no one?
Coaster
I'm Back Baby
Registered: 04/23/08
Posts: 25,306
Loc: Sativa Central
Last seen: 13 years, 9 months
Re: find a sum using sigma notation- MATH HELP [Re: Picklez ]
#160731 - 12/11/08 06:56 PM (16 years, 2 months ago )
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
Re: find a sum using sigma notation- MATH HELP [Re: Picklez ]
#160734 - 12/11/08 06:59 PM (16 years, 2 months ago )
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.
Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
Re: find a sum using sigma notation- MATH HELP [Re: Ombient ]
#160743 - 12/11/08 07:27 PM (16 years, 2 months ago )
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
Coaster
I'm Back Baby
Registered: 04/23/08
Posts: 25,306
Loc: Sativa Central
Last seen: 13 years, 9 months
Re: find a sum using sigma notation- MATH HELP [Re: Picklez ]
#160744 - 12/11/08 07:45 PM (16 years, 2 months ago )
my hands smell like kush n pussy
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Ombient
ɥɐɹq ɹǝqos
Registered: 04/20/08
Posts: 3,499
Re: find a sum using sigma notation- MATH HELP [Re: Picklez ]
#160750 - 12/11/08 08:00 PM (16 years, 2 months ago )
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."
Picklez
Registered: 04/20/08
Posts: 17,919
Last seen: 10 years, 7 months
Re: find a sum using sigma notation- MATH HELP [Re: Ombient ]
#160752 - 12/11/08 08:05 PM (16 years, 2 months ago )
Thank you, I know that first formula pretty well, but dont think I have used the 2nd one before Thanks!
Psychotropic Math
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