Answer :
The scientific notation: [tex]a\cdot10^n[/tex] where 1 ≤ a < 10 and n∈Z.
[tex]0.\underbrace{0009}_{4\to}38=9.38\cdot10^{-4}[/tex]
[tex]0.\underbrace{0009}_{4\to}38=9.38\cdot10^{-4}[/tex]