39 is a whole number as in not a fraction or decimal.
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sqrt(39) = ±6, to the nearest whole number.
It is 40 when rounded to the nearest whole number and not 39
39
It is 39 when rounded to the nearest whole number because .5 is rounded up to 1
When rounding 38.1 to the nearest whole number, you look at the first decimal place, which is 1. Since 1 is less than 5, you would round down. Therefore, 38.1 rounded to the nearest whole number is 38.