The Amount of a Certain Radioactive Isotope Present at Time $\mathrm { A } ( \mathrm { t } ) = 400 \mathrm { e } ^ { - 0.02664 \mathrm { t } }$

question 302

Multiple Choice

The amount of a certain radioactive isotope present at time t is given by $\mathrm { A } ( \mathrm { t } ) = 400 \mathrm { e } ^ { - 0.02664 \mathrm { t } }$ grams, where t is the time in years that the isotope decays. The initial amount present is 400 grams. How many grams remain
After 20 years? Round to the nearest hundredth.

• A) 681.48 g
• B) 234.78 g
• C) 379.25 g
• D) 397.87 g

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