The amount A, in grams, of a radioactive substance remaining after t years is given by the following table. Use an exponential model for these data to determine the half-life of the radioactive substance. That is, determine how long it takes for half of the substance to decay. Round your answer to two decimal places.
t 3 4 5 6 A 157.36 154.21 151.13 148.11?
A. 25.46 years
B. 34.50 years
C. 34.31 years
D. 25.00 years
Answer: C
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