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5 significant figures Each figure that contributes to the accuracy of a value is considered significant. So 2.9979 has 5 significant figures. The 10^8 does not contribute to the accuracy as it simply indicates the number of trailing zeroes (i.e. 299,790,000) that are simply a result of rounding from the actual value (299,792,458)

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15y ago
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13y ago

There are 5 significant figures in 2.9979 x 108

There are 9 significant figures in 2.99790000 x 104

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13y ago

1.89*103 has three significant figures

1.89*103=194.67=195(sf)

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8y ago

5 significant figures.

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Q: How many significant figure for 2.9979 x 108?
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