Verified Answer :

DoctorSenior

4.0 x 10^-5 (power -5)

You start shifting the decimal point to the 4 , and count how many movements the point moved and in here it's 5.
Since you're moving to the right so the power will be for negative

There is 6 zeros. So:

\(\displaystyle 0,000004= \frac{4}{1000000}\)

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