It is: 4.2*10^4
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It is: 4.2*10^4
0042000 = 42000 = 4.2*104.
4.2x10(4) Just remember to put dot between digits 1 to 9 and then get it into power of it's zeros including dot(point).
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".