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1. Unless there is a unit right after the number (like 7000 lbs), then there would be 4 significant figures.
Round 12 to 1 significant figure is 10.
0.000892 to 1 significant figure is 0.0009 (1st significant figure is the first non-digit from the left, where in this case you can omit the number 2 since it will make no difference to the answer)
654 rounded to one significant figure becomes 700.
1534 to 1 significant figure is 2000.