To find the common difference in an arithmetic sequence, we subtract the first term from the second term. Given the sequence:

$-19, -11, -3, \dots$

we can find the common difference, $d$, by subtracting $-19$ from $-11$:

$d = -11 - (-19) = -11 + 19 = 8$

So, the common difference $d$ is 8.

Would you like further explanation or have any questions about this process?

Here are 5 related questions to help reinforce the concept:

1. How would you find the 10th term in this sequence?
2. How can we determine the formula for the $n$-th term of an arithmetic sequence?
3. What is an example of an arithmetic sequence with a common difference of -5?
4. How can we tell if a sequence is arithmetic based on its terms?
5. What happens to the terms of an arithmetic sequence if the common difference is 0?

Tip: In an arithmetic sequence, the difference between consecutive terms is always constant, which is why we call it the "common difference."