Solve the problem.An artifact is discovered at a certain site. If it has 52% of the carbon-14 it originally contained, what is the approximate age of the artifact to the nearest year? (carbon-14 decays at the rate of 0.0125% annually.)
A. 2272 yr
B. 3840 yr
C. 5231 yr
D. 4160 yr
Answer: C
Mathematics
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Identify the distribution as symmetric, left-skewed, or right-skewed.Lengths of human pregnancies
A. Left-skewed B. Symmetric C. Right-skewed
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Use the trapezoidal rule to find the area.On an aerial photograph a region the widths of an area were measured at 
intervals as shown in the following table. Find the area.
A. 9.5 mi2 B. 13 mi2 C. 16 mi2 D. 11 mi2
Mathematics
Locate and classify all critical points for the given function.f(x,y) = x2 + x + y2 - y - 2
A. Minimum of - 
at 
B. Minimum of - 
at 
C. Maximum of - 
at 
D. Maximum of - 
at 
Mathematics
Find the sum of the sequence.
A. 27 B. 38 C. 56 D. 60
Mathematics