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.John earns $11.11 per hour. If he works 11 hours, how much will he earn?
A. $122.31 B. $123.31 C. $122.21 D. $122.22
Mathematics
Simplify the expression using the order of operations.5 ? 33
A. 135 B. 3375 C. 45 D. 30
Mathematics
Perform the indicated operation.3 yd 2 ft × 5
A. 18 yd 1 ft B. 18 yd 2 ft C. 24 yd 1 ft D. 6 yd 2 ft
Mathematics
Reduce the fraction, if possible.
A. 
B. 
C. 
D. 2
Mathematics