Suppose that the people in a certain city are catching cold. It is observed that after one week, 40% of the people who were sick are still sick. Of the people who were well, 30% are sick after one week. If, at some particular time, 20% of the people are ill, find the proportion of people who are sick after two weeks.
A. 0.668
B. 0.320
C. 0.332
D. 0.104
Answer: C
Mathematics
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x + 
= 
+ 
A. 
B. 
C. 
D. 
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A. ?
B. ?
C. ?
D. ?
E. ?
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Graph the function.f(x) = 
A. 
B. 
C. 
D. 
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