The sequence provided in the image is:

15, 28, 54, 93, ?, 210

We need to determine the missing number in this series.

Step-by-step analysis:

Let's look at the differences between consecutive terms:

1. $28 - 15 = 13$
2. $54 - 28 = 26$
3. $93 - 54 = 39$

It seems like the difference between consecutive terms is increasing by 13. Therefore, the next difference should be $39 + 13 = 52$.

Adding this to the last known term:

$93 + 52 = 145$

Thus, the missing number is 145.

Final sequence:

15, 28, 54, 93, 145, 210

The correct option is 145.

Would you like more details on this or have any questions?

Here are 5 related questions:

1. What kind of sequences have constant differences like this one?
2. How do you identify a pattern in a sequence quickly?
3. Could a sequence involve alternating operations instead of differences?
4. What happens if the differences aren't consistent in arithmetic terms?
5. How do geometric sequences differ from arithmetic sequences?

Tip: When working with sequences, always check the differences between terms first; if they don't match a pattern, consider squares, cubes, or other operations!