Question 189469: For the given sequence, identify if it is an aritmetic sequence by answering yes or no. If yes, then identify the common difference.
1. –9, 0, 9, 18, ...
2. 0.1, 0.01, 0.001, 0.0001, ...
3. Find the 25th term of the arithmetic sequence 26, 13, 0, –13, ...
Answer by user_dude2008(1862)   (Show Source):
You can put this solution on YOUR website! 1. –9, 0, 9, 18, ...
Is arithmetic, common difference d = 9
Rule:  for 
2. 0.1, 0.01, 0.001, 0.0001
Is not arithmetic, it is geometric
Rule: ^n) for
3. Find the 25th term of the arithmetic sequence 26, 13, 0, –13, ...
Arithmetic sequence
Rule:  where
25th term is when 
25th term: +26=-312+26=-286)
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