This sequence appears to alternate between positive and negative numbers, but we need to examine it further to understand the pattern. Let's analyze the differences between consecutive terms:

• From -12 to 11: the difference is $11 - (-12) = 23$.
• From 11 to -1: the difference is $-1 - 11 = -12$.
• From -1 to 10: the difference is $10 - (-1) = 11$.
• From 10 to 9: the difference is $9 - 10 = -1$.
• From 9 to 19: the difference is $19 - 9 = 10$.

There seems to be a varying pattern of differences. The sequence is alternating between larger jumps and smaller ones, which may suggest a mixed arithmetic pattern. To investigate further, let me try to predict the next term.

1. The pattern of differences seems to alternate between large positive, large negative, small positive, and small negative values.
2. If this pattern continues, the next difference after 10 could be something like -9, following the alternation between positive and negative values.

Thus, the next term might be: $19 - 9 = 10$

So, the next term in the sequence could be 10.

Would you like a more detailed breakdown of the pattern or further analysis?

Here are 5 questions related to the sequence:

1. Can you identify other sequences with alternating patterns in math?
2. How would you determine if this sequence follows an arithmetic or geometric pattern?
3. Could there be a way to represent this sequence with a formula?
4. How might this sequence evolve over a larger number of terms?
5. What happens if we examine sequences where the differences themselves form a secondary sequence?

Tip: When analyzing number patterns, checking the differences between terms can often reveal hidden arithmetic or geometric structures.