To express \( 8.35 \times 10^{-4} \) in decimal form, you can move the decimal point 4 places to the left because of the negative exponent:
Starting with 8.35:
- Move the decimal point 1 place left: 0.835
- Move the decimal point 2 places left: 0.0835
- Move the decimal point 3 places left: 0.00835
- Move the decimal point 4 places left: 0.000835
So, \( 8.35 \times 10^{-4} \) is equal to \( 0.000835 \).