The answer is: No; no common difference
Here's how to determine if the sequence is an arithmetic sequence and identify the common difference:
Check for a constant difference:
Calculate the difference between subsequent terms:
-1.1 - 2.2 = -3.3
0.1 - (-1.1) = 1.2
1.3 - 0.1 = 1.2
If the difference between any two consecutive terms is constant, the sequence is arithmetic.
Identify the common difference:
If the sequence is arithmetic, the constant difference observed in step 1 is the common difference (d).
In this case:
The difference between 2.2 and -1.1 is -3.3.
The difference between -1.1 and 0.1 is 1.2.
The difference between 0.1 and 1.3 is 1.2.
Since the differences are not constant, the sequence is not arithmetic. Therefore, the answer is: No; no common difference