Solve the problem.In the formula A(t) = A0ekt, A(t) 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. An artifact is discovered at a certain site. If it has 65% of the carbon-14 it originally contained, what is the approximate age of the artifact, rounded to the nearest year? (carbon-14 decays at the rate of 0.0125% annually.)
A. 2800 yr
B. 1497 yr
C. 5200 yr
D. 3446 yr
Answer: D
Mathematics
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Integrate the function.
A. 5 cos-1 
B. sin-1 
C. cos-1 
D. 
sin-1 
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Determine whether the pair of triangles is congruent. If congruent, state the property of congruence that applies (SSS, SAS, or ASA).
A. congruent; AAA B. congruent; ASA C. congruent; AAS D. not congruent
Mathematics
Solve the equation. Give an approximate solution to four decimal places.e(x + 7) = 4
A. 2.3979 B. -4.6021 C. -5.4959 D. -5.6137
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Perform the indicated operation and, if possible, simplify.
+ 
A. 6
B. 
C. 
D. 
Mathematics