Neither. No common difference. No common ratio.
The given sequence is arithmetic with a common difference
of nine.
The sequence is geometric with a common ratio of r = 0.8 .
The first term is 13.
Since the sequence is geometric and it's common ratio is a positive
number less than one, the sequence converges to zero.
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TEST 8A Answers (#150)
A geometric series converges if and only if the absolute value of
its common ratio is less then one.
Since the common ratio is two thirds the series converges.
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TEST 8A Answers (2/3)
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TEST 8A Answers (3/3)