Final answer:
To round to the nearest whole number, keep the number as it is since it is already a whole number. To round out to one decimal point, leave the number as it is since it is a whole number with no decimal places.
Step-by-step explanation:
To round to the nearest whole number, you need to look at the decimal part of the number. If the decimal part is less than 0.5, you round down to the previous whole number. If it is 0.5 or greater, you round up to the next whole number. For example, if you have 15.6, the decimal part is 0.6, which is greater than 0.5, so you round up to 16. If you have 15.3, the decimal part is 0.3, which is less than 0.5, so you round down to 15. In this case, you are asked to round the number 15 s, so there is no decimal part and the number remains the same, which is 15.
To round out to one decimal point, you need to look at the second decimal place. If it is 5 or greater, you round up the first decimal place. If it is less than 5, you leave the first decimal place as it is. For example, if you have 15.46, the second decimal place is 6, which is 5 or greater, so you round up the first decimal place to 4.5. If you have 15.43, the second decimal place is 3, which is less than 5, so you leave the first decimal place as 4.4. In this case, you are asked to round out to one decimal point, but the number given is 15 s, which is a whole number and has no decimal places, so it remains as it is, which is 15.