Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 41 grams, how much will remain after 94 years? Round your answer to four decimal places.
?
A. 9.5014 grams
B. 0.2142 grams
C. 0.0000 grams
D. 10.2500 grams
E. 37.4174 grams
Answer: B
Mathematics
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A. vertex: (3, 1)
focus: (3, 2)
directrix: y = 0
B. vertex: (-3, -1)
focus: (-2, -1)
directrix: x = -4
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focus: (2, 3)
directrix: x = 0
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