4050
If you are using 4.05 x 103 it might be due to a measurement of some kind in your science studies. If this is the case then the precision of your measurement is only 3 significant digits. Note the decimal equivalent above: the zero to the far right would then NOT be significant.
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Ten to the 3rd power is 1000. Move the decimal over 3 places. 8,200
43
3.200, I believe.
3500.0 or 3,500
3.4 x 103 = 3,400