Plutonium-239 is a primary component of modern nuclear weapons. If there is initially 6 kilograms, then after t thousand years, the amount remaining is given by
.
Over what time range will there be between 1 and 2 kilograms of plutonium-239 remaining? Round your answer to two decimal places.
A. From 38.36 to 62.56 thousand years
B. From 20.27 to 24.77 thousand years
C. Up to 62.56 thousand years
D. Up to 20.27 thousand years
Answer: A
Mathematics
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A. - 
B. 1
C. 2
D. 
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Fill in the blank(s) with the appropriate word(s).
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