Scientific notation is a compact way of writing very large and very small numbers.
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210,000,000 in scietific notation is 2.1*10^8
0.00000238 = 2.38 x 10^-6
In scientific notation it is: 5.098*10^6
5.7 x 104 This is already in scietific notation. No need to align it further.
The scientific notation of 0.000002505 is 2.505 x 10^-6.