Answer :
The precision of the mass of the sand in the sandbox is to the nearest tenth of a pound.
The initial sand amount is given as 12.8 pounds, which implies a precision of one decimal place. When you add an additional 45 pounds, the precision of this amount is also to one decimal place. Since both quantities have the same precision (one decimal place), the sum of these amounts, which is 12.8 pounds + 45 pounds = 57.8 pounds, will also have a precision of one decimal place.
The mass of the sand in the sandbox to the nearest tenth of a pound because the tenths place is the least precise digit in both the initial and additional sand measurements, and it dictates the overall precision of the final sum.
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