Multiple Choice Question (MCQ)
Determine whether each of the following sequences is an arithmetic sequence. If it is, write down its common difference.

×
1, 8, 27, 64

✓
5, −12, −29, −46

×
3.2, 3.23, 3.232, 3.232 3

×
\dfrac{2}{3},\dfrac{1}{3},\dfrac{1}{3},\dfrac{1}{6}