Solve the problem.An office contains 1000 ft3 of air initially free of carbon monoxide. Starting at time = 0, cigarette smoke containing 4% carbon monoxide is blown into the room at the rate of 0.5 ft3/min. A ceiling fan keeps the air in the room well circulated and the air leaves the room at the same rate of 0.5ft3/min. Find the time when the concentration of carbon monoxide reaches 0.01%.
A. 7.01 min
B. 6.01 min
C. 8.01 min
D. 5.01 min
Answer: D
Mathematics
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B. Converges; 
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Find the domain of the function. Write the domain using interval notation.f(x) = 
A. (-?, -9) ? (-9, ?) B. (-?, -5) ? (-5, 5) ? (5, ?) C. (-?, 0) ? (0, ?) D. (-?, 9) ? (9, ?)
Mathematics
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2
A. 
B. 
C. 
D. 
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Evaluate.
A. 4
B. 
C. 1
D. 4!
Mathematics