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OpenStudy (anonymous):
how do i determine the 8th term of this arithmetic sequence: 9, -18, 36, -72,...?
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OpenStudy (anonymous):
a = 9 d = ? (I don't know.. ) n = 8
OpenStudy (anonymous):
it is geometric progression common ratio = -2 nth term formula is a*r^(n-1)
OpenStudy (anonymous):
ohhhh, riiight I was thinking of this as arithmetic, thank you for the reminder!!
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