The question is difficult to answer because there is no decimal point in the question. So here are the answers to the two most likely alternatives:
.0000003 m = 3*107 m
0.000003 m = 3*106 m
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9.3*10-3 m
204500 = 2.045 x 10^5
35 nm = 0.000000035m So we don't have to deal with so many zeroes we write it as 3.5 x 10-8 m.
The standard notation is: 8,800,000,000
m + 8