A Sample of 200 Grams of Radioactive Substance Decays According $\mathrm { A } ( \mathrm { t } ) = 200 \mathrm { e } ^ { - 0.031 \mathrm { t } }$

question 128

Multiple Choice

A sample of 200 grams of radioactive substance decays according to the function $\mathrm { A } ( \mathrm { t } ) = 200 \mathrm { e } ^ { - 0.031 \mathrm { t } }$ where t is the time in years. How much of the substance will be left in the sample after 40 years? Round your answer to the
Nearest whole gram.

• A) 1 gram
• B) 2465 grams
• C) 58 grams
• D) 0 grams

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