Rocamptbubbs Rocamptbubbs

21-04-2017
Mathematics

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Find the sum of the finite geometric series. 4 20 100 ... 312,500 the sum of the geometric series is .

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reganscute reganscute

24-04-2017

What is the 9th term of the geometric sequence 4, -20, 100, ...
First term, a = 4
common ratio, r = –20 / 4 = –5
..... ..... ..... ..... = 100 / –20 = –5
9th term = 4 ( –5 ) ^ ( 9 - 1 )
..... ...... = 4 ( –5 ) ^ 8
..... ...... = 4 ( 390,625 )
..... ...... = 1,562,500

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