Respuesta :
Answer:
-6
Step-by-step explanation:
In an arithmetic sequence, the common difference is the difference between each number in the sequence.
In this sequence, the common difference is -6 because from left to right, we can see that the numbers decrease by 6 each time.
For example, 12 - 6 = 6.
Answer:
every step you subtract 6 so the common difference is -6