Solve the problem.The formula for the circumference of a circle is C = 2?r. Determine the circumference when the radius r is 
A. 49 in
B. 14? in
C. 14 in
D. 49? in
Answer: B
Mathematics
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Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 1400 years B. 1600 years C. 800 years D. 2308 years
Mathematics
Find the standard deviation for the given data. Round your final answer to one more decimal place than that used for the observations.The pH of a patient's blood:7.41, 7.43, 7.36, 7.41, 7.35
A. 0.070 B. 0.032 C. 0.001 D. 0.080
Mathematics
Determine whether the ordered pair is a solution to the inequality.x + 2y < -6: (6, -5)
A. Yes B. No
Mathematics
Find the domain of the function.h(x) = 
A. {x|x ? 4} B. all real numbers C. {x|x ? -8, 0, 8} D. {x|x ? 0}
Mathematics