To find the next number in the last row of the image, we can try to detect a pattern in the sequence of numbers in that row:
05, 75, 15

The numbers seem to alternate, possibly in steps related to differences or some operation between them. Let's analyze this:

• The difference between 75 and 05 is $75 - 05 = 70$.
• The difference between 75 and 15 is $75 - 15 = 60$.

It appears that the pattern decreases by 10 each time:

• First, the difference was 70.
• Then, the difference became 60.

If this pattern holds, the next difference should be 50:

• $15 - 50 = -35$.

Thus, the next number should be -35.

Would you like to explore more details about this, or analyze the pattern in a different way?

Here are 5 related questions to expand this idea:

1. Could a different sequence logic apply, such as alternating operations?
2. What happens if we focus on digit patterns instead of differences?
3. Is there any significance in the other numbers surrounding this row?
4. Can we apply a modular arithmetic approach to the sequence?
5. Is there a visual or positional pattern affecting this row?

Tip: In number sequences, always check both the differences and the ratios between terms. They can often reveal hidden patterns!