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ridgeboy36
Group Title
What is the sum of a 6term geometric series if the first term is 8 and the last term is 134,456 ? Answers to choose from.
a)129,513
b)130,624
c)156,864
d)172,846
 one year ago
 one year ago
ridgeboy36 Group Title
What is the sum of a 6term geometric series if the first term is 8 and the last term is 134,456 ? Answers to choose from. a)129,513 b)130,624 c)156,864 d)172,846
 one year ago
 one year ago

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cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
let the first term = a then 6th term =ar^5 where r = common ration can you find r from this information?
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
i might need some guidance but let me try!
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
i really dont know how i got this but i ended up with 832 as the common ratio.
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
6tt term = 134456 = ar^5 ist term = 8 so ar^5/a = r^5 = 134456/8 = 16807
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
dw:1357256722836:dw
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
you can now find the sum of the 6 terms by plugging in the values of a and r into the formula sum = a * r^n  1  r  1
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
ohh i see what i di wrong !! i was way off
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
im almost done
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
the value of n (number of terms) is 6
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
okayy i got c)156,864
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.1
right , good job
 one year ago

ridgeboy36 Group TitleBest ResponseYou've already chosen the best response.0
thankyou
 one year ago
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