Algebra-1

To determine which sequence is not an arithmetic sequence, we need to check if the differences between consecutive terms are consistent.

For 0.5, 1.5, 2.5, 3.5, 4.5:

Differences: 1.5 − 0.5 = 1.0, 2.5 − 1.5 = 1.0, 3.5 − 2.5 = 1.0, 4.5 − 3.5 = 1.0

Differences are consistent (1.0), so this is an arithmetic sequence.

For 1.2, 2.4, 3.6, 4.8, 6.2:

Differences: 2.4 − 1.2 = 1.2, 3.6 − 2.4 = 1.2, 4.8 − 3.6 = 1.2, 6.2 − 4.8 = 1.4

Differences are not consistent (1.2, 1.2, 1.2, 1.4), so...