Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.125% annually. Determine the half-life of this isotope, to the nearest year.
A. 241 years
B. 6 years
C. 555 years
D. 400 years
Answer: C
Mathematics
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A. 9x2 + 49y2 B. 3x2 - 42xy + 49y2 C. 3x2 + 49y2 D. 9x2 - 42xy + 49y2
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Mathematics
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A. Circle B. Ellipse C. Paraboloid D. None of these
Mathematics
Answer the question.What does the digit 8 mean in the number 680,305,736,373?
A. ten-billions B. billions C. hundred-billions D. ten-millions
Mathematics