Answer
$0.00012$
Work Step by Step
To convert a number in scientific notation to a number in standard notation, we must move the decimal point to the left or right by the exponent of $10$ in the scientific notation. If the exponent is positive, we move the decimal right. If the exponent is negative, we move the decimal left.
We are trying to convert $1.2\times10^{-4}$ to standard notation. Since the exponent of $10$ is $-4$, we move the decimal point $4$ places to the left, giving us $0.00012$.
