Final answer:
The sequence is not an arithmetic sequence because the difference between each pair of successive terms is not constant.
Step-by-step explanation:
To determine whether the list of numbers given, namely -1.9, -2, -2.2, -2.5, -2.9, forms an arithmetic sequence, we must verify if the difference between consecutive terms is constant. In an arithmetic sequence, this difference (also known as the common difference) is the same for any pair of successive terms. Let's calculate the differences:
Difference between the first and second term: -2 - (-1.9) = -0.1
Difference between the second and third term: -2.2 - (-2) = -0.2
Difference between the third and fourth term: -2.5 - (-2.2) = -0.3
Difference between the fourth and fifth term: -2.9 - (-2.5) = -0.4
The differences between each pair of successive terms are not equal, and thus, the sequence is not an arithmetic sequence.