Solve the problem.If f(x, y) = (4,000ey)/(1 + 
/2) represents the population density of a planar region on Earth, where x and y are measured in miles, find the number of people within the rectangle -9 ? x ? 9 and -4 ? y ? 0.
A. 8,000(1 - e-4) ln 
? 13,388
B. 4,000(1 - e-4) ln 
? 6,694
C. 8,000(1 - e-4) ln 5 ? 18,832
D. 16,000(1 - e-4) ln 
? 26,776
Answer: D
Mathematics
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