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. 3.7 g
B. 0.1 g
C. 11.2 g
D. 7.5 g
Answer: D
Mathematics
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A. Does not exist
B. - 
C. 0
D. - 
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Find the length of the curve.The cardioid r = 5(1 - cos ?)
A. 
B. 
?
C. 40?
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