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. 555 years
C. 6 years
D. 400 years
Answer: B
Mathematics
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the y-axis.y = 8 - x2, y = x2, x = 0
A. 8? B. 32? C. 4? D. 16?
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Write the Babylonian numeral as a Hindu-Arabic numeral.
A. 60 B. 85 C. 140 D. 120
Mathematics
Find the derivative.f(x) = 2x2 - 4x - 5
A. 4x2 - 4x - 5 B. 2x - 4 C. 4x - 4 D. 2x2 - 4
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Represent the sets on a number line.{x|-3 < x < 1}
A. 
B. 
C. 
D. 
Mathematics