Final answer:
Fixed signals are those whose digits are significant and are stated explicitly in the rulebook. The 5, the 2, and the 9 in the signals are significant. The trailing zero is also significant.
Step-by-step explanation:
Fixed signals are those whose digits are significant and are stated explicitly in the rulebook. According to the given rules, the 5, the 2, and the 9 in the signals are significant.
- The 5 is significant because it appears in the tens place.
- The 2 is significant because it appears in the ones place.
- The 9 is significant because it appears in the tenths place.
The trailing zero is also significant as per rule 5.