42.8 km = 42800 metres = 4280000 cm which is 4.28 x 106.
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The scientific notation for 4113.000 cm is 4.113 × 103cm
It is 3 cm. Exactly as in the question.
0.000234 cm in Scientific Notation = 2.34 x 10-4cm
It is: 9.68*101 cm
30,000,000,000 cm/sec in Scientific Notation = 3 x 1010 cm/sec