How do you write 0.00086 in scientific notation? 86times 10^-3 8.6times 10^-3 8.6times 10^-4 0.86times 10^-4

To write \( 0.00086 \) in scientific notation, we follow these steps:<br /><br />1. **Identify the significant digits**: The significant digits in \( 0.00086 \) are \( 8.6 \).<br />2. **Determine the power of 10**: To convert \( 0.00086 \) into a number between \( 1 \) and \( 10 \), move the decimal point 4 places to the right. This corresponds to multiplying by \( 10^{-4} \).<br /><br />Thus, \( 0.00086 = 8.6 \times 10^{-4} \).<br /><br />### Correct Answer:<br />\( \mathbf{8.6 \times 10^{-4}} \)