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Anonymous
It is: 4.2*104
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4.2 × 10-2
0042000 = 42000 = 4.2*104.
It is 4.2X10^4
0.042000 = 4.2 x 10-2.
0.042000 = 4.2 x 10-2
It is 8.9*10^-5 in scientific notation