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anonymous
 one year ago
what is the sum of the geometric sequence 3 , 18, 108 if there are 7 terms?
anonymous
 one year ago
what is the sum of the geometric sequence 3 , 18, 108 if there are 7 terms?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The answer choices are: 719,835 119,973 119,973 719,835

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0There are four answer choices

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1Sum of n terms = a1 r^n  1  r  1 whre a1 = first term and r = common ratio

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1so plug in a1 = 8 , r = 6 and n = 7

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So it's 3(6)^71 over 61?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1not exactly  work out the (6)^7 first then subtract 1 then divide by 7 finally multiply by 3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 119,973 is that right?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1I should have written the (r^n  1) like that  in parentheses

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay thank you very much

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1oh = press best response
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