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. 6.01 min
B. 5.01 min
C. 7.01 min
D. 8.01 min
Answer: B
Mathematics
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Solve the problem.Determine whether 
is a solution of the system 9x + 6y + 9z = 5 6x + 3y - 3z = 14 x - y + 2z = -3.
A. No B. Yes
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Find the measure of ?x in the triangle.
A. 56° B. 124° C. 46° D. 87°
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Write the partial fraction decomposition of the rational expression.
A. 
+ 
+ 
- 
+ 
B. 
- 
- 
+ 
- 
C. 
- 
+ 
- 
D. 
- 
+ 
- 
Mathematics