To express \( 8.459 \times 10^{-5} \) in standard decimal notation, you need to move the decimal point in the number 8.459 five places to the left (because of the negative exponent).
Starting with 8.459:
- Move the decimal point one place to the left: 0.8459
- Move it another place to the left: 0.08459
- Move it again: 0.008459
- Move it once more: 0.0008459
- Move it one last time: 0.00008459
So, \( 8.459 \times 10^{-5} \) is equal to \( 0.00008459 \).
The correct response from your options is: .00008459.