iparis21 Posted January 24, 2017 Report Share Posted January 24, 2017 I'm having a little trouble doing this question. Any thoughts on how to solve it? QUESTION:The first term of a geometric series is 6 and the sum of the first 15 terms is 29. Find the common ratio. Reply Link to post Share on other sites More sharing options...
kw0573 Posted January 24, 2017 Report Share Posted January 24, 2017 It's just plug in a = 6, n = 15 into geometric series formula: 29 = 6(1 - r^15) / (1 - r). Then on a calculator graph y = 6(1 - r^15) / (1-r) and y = 29 to find intersection. Reply Link to post Share on other sites More sharing options...
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