Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 79 grams, how much will remain after 6 years?
A) 0.0725 grams
B) 62.5417 grams
C) 56.4895 grams
D) 18.8581 grams
E) 19.7500 grams
C) 56.4895 grams
Mathematics
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and 
A. 
B. 
C. 
D. 
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(4t)i + 2ln(t - 9)j - 
k
A. v(0) = -4i - 
j
B. v(0) = 4i - 
j
C. v(0) = -
j
D. v(0) = 
j
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A. 
B. 
C. 
D. 
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Convert the units using unit fractions.56 qt = 
gal
A. 56 B. 28 C. 112 D. 14
Mathematics