17.9867 to 3 significant figures is 18.0
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It is 1570000 rounded to 3 significant figures
The number 10.989 rounded to 3 significant figures is 11.0
1760
5.00x10^6
Non-zero numbers are always significant and leading zeros are never significant. So 0.007222 has 4 significant figures so rounding to 3 would give you 0.00722.