There's nothing to change here. There is no advantage or reason to write 7.2 in scientific notation. Technically, however, it could be written as 7.2 × 100, but this is not normally done.
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This is standard notation for seventy two.72
The exponential notation of 72 is: 7.2 × 101 or 7.2E1
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.