You can not determine unless you know the nature of the numbers. If 2 and 7 are not exact numbers, the answer is 10. If they are exact numbers, as in I see 7 people each holding 2 balls, the answer is 14.
Con't confuse simple arithmetic with calculations involving measurements. Measurements have units, and measurements are made to the precision of the measuring instrument. It is highly unlikely that actual measurements would be expressed to one significant digit. What would be the point?
Therefore, being concerned about the precision of 2 x 7 is silly.
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You can not determine unless you know the nature of the numbers. If 2 and 7 are not exact numbers, the answer is 10. If they are exact numbers, as in I see 7 people each holding 2 balls, the answer is 14.
Con't confuse simple arithmetic with calculations involving measurements. Measurements have units, and measurements are made to the precision of the measuring instrument. It is highly unlikely that actual measurements would be expressed to one significant digit. What would be the point?
Therefore, being concerned about the precision of 2 x 7 is silly.