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 0.25% annually. Determine the half-life of this isotope, to the nearest year.
A. 200 yr
B. 120 yr
C. 3 yr
D. 277 yr
Answer: D
Mathematics
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A. - 
B. - 
C. - 
D. -7
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Write the percent as a decimal. Round to the nearest thousandth if the division does not terminate.810%
A. 8.11 B. 81 C. 0.81 D. 8.1
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Find all real solutions of the equation.
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Fill in the blank(s) with the appropriate word(s).
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Divide using synthetic division.(x4 + 256) ÷ (x - 4)
A. x3+ 4x2 + 16x + 64 + 
B. x3- 4x2 + 16x - 64 + 
C. x3+ 4x2 + 16x + 64
D. x3+ 4x2 + 16x + 64 + 
Mathematics