Explain the steps for writing 0.1in scientific notation.

Scientific notation is
n*10ᵇ
where
1≤n<10 and b is how many spaces you moved the decimal to the left, if  you moved it to the right, make b negative

0.000000001 to
1.000000000
9 spaces
to the right so negative

1*10⁻⁹ is answer

2.) is the most sense