When rounding 7463 to 2 significant figures, we look at the digit in the hundred's place, which is 4. Since the digit immediately to the right of the hundred's place is 6, which is 5 or greater, we round up the hundred's place digit by 1. Therefore, 7463 rounded to 2 significant figures is 7500.
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It is then 30,000 rounded to 1 significant figure
Rounded to 1 significant figure it is 0.4
It is then 0.067 when rounded to 2 significant figures
6694 rounded to 1 significant figure is 7000
6,256 rounded to 1 significant figure is 6,000