1. Move the decimal point:

Start with 0.00075 and move the decimal point four places to the right, until you have a number between 1 and 10. This gives you 7.5.

2. Count the moves:

You moved the decimal point four places to the right.

3. Express as a power of 10:

Since you moved the decimal right, the exponent of 10 will be negative. Since you moved it four places, the exponent is -4.

4. Combine the pieces:

The scientific notation is 7.5 x 10⁻⁴