SOLUTION: is this a geometric sequence. 1, -2, 4, -8, 16 true or false is this a geometric sequence 2, 4, 8.5, 16 true or false

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Question 879779: is this a geometric sequence.
1, -2, 4, -8, 16 true or false
is this a geometric sequence
2, 4, 8.5, 16 true or false
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
{1, -2, 4, -8, 16 } r = -2 Yes geometric
{2, 4, 8.5, 16}, see no pattern..8.5 not in sync