1. Move the decimal point:

Start with 0.00074 and move the decimal point to the right until you have a number between 1 and 10. In this case, you'll move it four places to the right:

0.00074 → 7.4

2. Count the decimal places:

You moved the decimal point four places to the right.

3. Combine the number and exponent:

The number you get after moving the decimal (7.4) is multiplied by 10 raised to the power of the number of places you moved the decimal. Since you moved it four places to the right, the exponent is -4.

Therefore, 0.00074 in scientific notation is 7.4 x 10⁻⁴.