SOLUTION: Given that the first term of a geometric sequence is -320 and seventh term is -3645, the common ratio to the nearest tenth is?

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Question 849071: Given that the first term of a geometric sequence is -320 and seventh term is -3645, the common ratio to the nearest tenth is?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Tn = t * r^(n - 1)
-3645 = -320 * r^(6)
r = -3/2 or -1.5
r = 3/2 or 1.5