The half-life of a certain radioactive substance is  5 years. What is the yearly percentage decay rate for this substance? Round your answer to two decimal places if necessary.
?

A. 10.65%
B. 12.94%
C. 13.87%
D. 10%

Answer: B

Mathematics

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A. m = -7; (0, 7)
B. m = ; 
C. m = - ; 
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A. 1.9 x 106 sec B. 1.9 x 10-7 sec C. 1.9 x 105 sec D. 1.9 x 1012 sec

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