Solve the problem.A 100 gal tank is half full of distilled water. At time = 0, a solution containing 2 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 
When the tank is full, how many pounds of concentrate will it contain?
A. 200 pounds
B. 150 pounds
C. 187.5 pounds
D. 175 pounds
Answer: C
Mathematics
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Solve the problem.John does 12 pushups on the first day of a 30-day month, and then increases the number of pushups by 2 pushups a day. How many pushups has he done by the end of the month?
A. 1218 B. 1260 C. 1230 D. 1290
Mathematics
Graph the curve.r = 
(spiral)
A. 
B. 
C. 
D. 
Mathematics
Write the decimal using numbers.two tenths
A. 20 B. 0.02 C. 0.2 D. 0.002
Mathematics
Use the graph of 
to write an equation for the function whose graph is shown.
?
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics