Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I 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 0.225% annually. Determine the half-life of this isotope, to the nearest year.
A. 3 yr
B. 308 yr
C. 134 yr
D. 222 yr
Answer: B
Mathematics
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Write a description of the shaded region using the symbols A, B, C, ?, ?, -, and ' as needed.
A. B - A' B. A - B C. B ? A' D. A ? B'
Mathematics
43.4 millivolts is the same as:
a. 434 microvolts b. 0.0434 kilovolts c. 0.0434 volts d. 4.34 volts e. 43.4 volts
Mathematics
Solve the problem.If n(A) = 40, n(B) = 117 and n(A ? B) = 137, what do you know about n(A ? B)?
A. n(A ? B) = 20 B. 60 C. n(A ? B) = 10 D. n(A ? B) = 22
Mathematics
Express as a product.loga t3
A. log a 3t B. log a 3 C. 3 log a t D. log a 3 ? log a t
Mathematics