Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that , when t is measured in hours. If there are of reactant present when t = 0, how many grams will be left after ? Give your answer to the nearest tenth of a gram.

A. 0.1 g
B. 3.9 g
C. 1.9 g
D. 5.8 g


Answer: B

Mathematics

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Mathematics