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 51% 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. 4080 yr
B. 3920 yr
C. 2339 yr
D. 5387 yr
Answer: D
Mathematics
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Multiply the monomials.10x5 ? 5x4
A. 50x20 B. 50x9 C. 100x9 D. 15x9
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Set up the percent proportion for the application problem. Do not try to solve for any unknowns.In a one-day storm, Odentown received 19% of the normal rainfall for a season. Odentown received 8 inches of rain that day. How many inches of rain normally fall during the season?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Find the vertex of the parabola.f(x) = x2 - 20x + 108
A. (8, 0) B. (0, 10) C. (8, 10) D. (10, 8)
Mathematics
Find the requested value.
{x2 - 5x + 1, if x ? 2x, if x > 2
A. -5 B. 2 C. 13 D. -7
Mathematics