Answer: 1.25 x 10^-3
Step-by-step explanation:
Scientific notation is always a number between 1-10 TIMES 10 to whatever power representing the number it's moved. Exponent can be positive or negative depending on the direction it's moving, in this case it is negative because we are moving the decimal from 0.00125 to 0001.25, 3 spaces to the RIGHT = negative. If it were to move to the left it would be positive.