Problem
Two-thousand ounces of a radioactive substance are stored in a radioactive container. The amount, in ounces, of the substance that is can be modeled by the equation \( y=2000 e^{-0.00043 t} \), where \( y \) is the amount of the substance left after \( t \) years. Approximately how many years will it take until 50 ounces of thic
Solution
Step 1 ：\( 50 = 2000 e^{-0.00043 t} \)
Step 2 ：\( e^{-0.00043 t} = \frac{1}{40} \)
Step 3 ：\( t \approx 1590.3682 \)
