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Help with these practice problems please

Dec 4. (20 pts) Convert the following,using proper sig figs. a. 473900 mg to kg b. 5.443 cm/sec to m/hrs 4. (S pts) In Canada the speed limit on a highway is 100. Km/hour per. what would that be in miles per hour? (1mile-1.609 5. (5 pts) Why is the concept of scientific notation important? 6. (8 pts) How many significant figures are in each number a. 342000 b. 0.0450 c. 21876. 8 planets around sun

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Help with these practice problems please Dec 4. (20 pts) Convert the following,using proper sig figs....
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