145 * 10^4
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0.019807 rounds to 0.01981
2.540x10^4
2.31 has 3 significant figures 4 has 1 significant figure 8.123 has 4 significant figures
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.
5020 has 3 significant figures. It could also have 4 significant figures if, for example, 5019.6 was rounded to 4 significant figures.