You have the following expression:
10⁻³
as a fraction, the previous number can be written as follow:
10⁻³ = 1/10³
becasue you can write a factor with negative exponent as the inverse of the same factor with positive exponent.
as a decimal, consider that the coefficient of the expoenent and the minus sign of the exponent, means that you can move decimal point to the left as many as the value of the coefficient of the exponent, that is:
10⁻³ = 0.001
Hence, the asnwer is:
1/10³ and 0.001
