chemistry homework help?!? 10 points for best answer!!!?

answerer

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1) Do the following calculations, and write the answers with the correct number of significant figures: 3.5e3 x 2.11e4= ?

2) Do the following calculations, and write the answers with the correct number of significant figures: 0.0058 km x 0.228 km = ?

3) Do the following calculations, and write the answers with the correct number of significant figures: 5650 L / 27 min = ?

please answer!!!
i dont get the whole significant digit thing.
 
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