The 6th term of a geometric sequence is 28, and the first term is -2, then the common ratio is_________________ .
The nth term of geometric sequence = the first term times the common ration taken to the (n-1) power
So, if the 6th term is 28, the 28 = (-2)(r)^5
r^5 = 28/-2 = -14
r = (-14)^1/5 = -1.695
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