Solve the problem.The amount of a certain radioactive isotope present at time t is given by 
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. 234.78 g
B. 397.87 g
C. 681.48 g
D. 379.25 g
Answer: A
Mathematics
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What will be an ideal response?
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A. 
B. 
C. 
D. 
E. 
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