How lots of significant figures, Chemistry

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How lots of significant figures are in the following measurements?

a. 0.002 849 kg

b. 40 030 kg

Imply rules 1-4 from above. Verify your answers by writing the quantities in scientific notation.

a. 0.002 849 kg has four significant figures 2.849 * 10-3

b. 40 030 kg has four significant figures 4.003* 104


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