Solve the problem.A 200 gal tank is half full of distilled water. At time = 0, a solution containing 1 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 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. 120 pounds
B. 100 pounds
C. 200 pounds
D. 150 pounds
Answer: D
Mathematics
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Add or subtract.(9 + 5i) - (-8 + i)
A. -17 - 4i B. 1 + 6i C. 17 + 4i D. 17 - 4i
Mathematics
Answer the question about the given function.Given the function f(x) = -4x2 - 8x - 4, list the y-intercept, if there is one, of the graph of f.
A. -16 B. -12 C. -4 D. 0
Mathematics
Divide f(x) by g(x) and write in the form 
= quotient + 
.f(x) = x4 + x2 + 7; g(x) = x2 - x + 6
A. x2 + x - 4 + 
B. x2 + x - 4 + 
C. x2 - x - 4 + 
D. x2 + x - 4 + 
Mathematics
Solve the problem.The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by 
for 
Find the probability that the call lasts between 1 and 3 minutes.
A. 1.0014 B. 0.0014 C. 0.8736 D. 0.9986
Mathematics