2100
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I suspect the answer is 20000 but the wording of the question makes it is difficult to be sure.
When rounding 5555 to 2 significant figures, we start counting from the leftmost non-zero digit. In this case, the leftmost non-zero digit is 5. The next digit after 5 is 5, which is greater than or equal to 5, so we round up the leftmost non-zero digit. Therefore, 5555 rounded to 2 significant figures is 5600.
600 same as rounding to 1 significant figure
No, 6. You count from the first non-zero digit to the last non-zero digit. Zeros between non-zero digits are counted.
When rounding to 1 significant figure, we look at the first non-zero digit from the left. In this case, the first non-zero digit is 6. Since the digit immediately following it is less than 5, we round down. Therefore, 0.006772 rounded to 1 significant figure is 0.006.