900
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14.767 can be rounded to 15 if it is to be rounded to the nearest whole number. If it is rounded to the next significant digit, it would be 14.77, or 14.8 if rounded to one decimal place.
5 kilometers. A significant figure is anything except a 0, before a decimal point.
30.54 rounded to one decimal place = 30.5. Because the least significant digit is 4 it is rounded down. Had it been 5 or above the answer would have been rounded up to 30.6
1,246 rounded to one significant figure is 1,000
To one significant digit, 37.19 is 4x101. Writing it as 40 makes it unclear as to whether you have 1 significant digit or 2.