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Q: Determine the number of significant figures in each measurement 12.90s?

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3 of them.

The leading zeros are never counted as significant figures, therefore the answer is two.

The measurement 77.09m has four significant figures.

There are 4 significant figures in this number.

There are 4 significant figures in this number.

There are six significant figures

The number of significant figures should be equal to the significant figures in the least precise measurement.

4 of them.

0.0136

4 significant figures.Zeros are significant if they are between two non-zero numbers, or if they are "trailing" zeros in a number with a decimal point.Eg.0.000047 = 2 significant figures4.7000 = 5 significant figures

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The accuracy of the measurement device determines the number of significant figures that should be retained in recording measurements.

2

There are 6.

0.00042, 0.00099

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The fact that there is a trailing zero and the number is not given as 70g is indicative that the number is accurate to the nearest hundredths. Therefore, it has four significant figures.

The least precise measurement.

5 of them.

3 of them.

Because you haven't told us what the measurement is.

That measurement has 4 significant figures. It could also be stated as 1.580 x 10^-3.