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OpenStudy (anonymous):
Find the indicated sum for the geometric series. S5 for 12 - 24 + 48 - 96 + ... Find the 9th term of the geometric sequence with a2 = 0.3 and a6 = 0.00003.
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OpenStudy (tad1):
r = -2 so -2 * _96 = 192
OpenStudy (tad1):
there are 4 spaces between a2 and a6 the difference between them is .3 - .00003 find the difference and divide by 4. that will be your common ratio. there are 3 spaces between a6 and a9.so multiply a6 by r^3 to get a9
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