Solve the problem.The half-life of an element is 4.2 × 1012 yr. How long does it take a sample of the element to decay to 
of its original mass? Use 
where A0 is the initial amount, T is the half-life, and t is the time. (Express results in scientific notation, rounded to the nearest hundredth.)
A. 5.07 × 1012 yr
B. 2.46 × 1012 yr
C. 1.21 × 1012 yr
D. 1.18 × 1012 yr
Answer: B
Mathematics
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Find the requested value using the given stock table. 
Dividend for CompuStrateg (CPS)
A. $0.44 B. $1.31 C. $0.68 D. $1.60
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Find the eccentricity of the hyperbola.Find the eccentricity of a hyperbola centered at the origin having a focus of 
and corresponding directrix 
A. 
B. 
C. 
D. 
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Use a calculator to approximate to three decimal places.-
A. -28.710 B. 28.738 C. 28 D. -28.723
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Simplify, if possible.
A. 1
B. 
C. 2
D. 
Mathematics