There's nothing to change here. There is no advantage or reason to write 4.20 in scientific notation. Technically, however, it could be written as 4.20 × 100, but this is not normally done.
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It is: 4.2 x 10^2
4.2 x 108
1,420 is expressed as 1420.0. Move 3 decimal places to the left, so the exponent for base 10 is 3. Therefore, in scientific notation, the given value is: 1.42 x 103
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".