Solve the problem.Suppose a tank contains 100 gallons of a solution of 10 lb of salt dissolved in water, which is kept uniform by stirring. If pure water is allowed to flow into the tank at a rate of 3 gallons per minute, and the mixture flows out at a rate of 2 gallons per minute, find an expression for the amount of salt in the tank after t minutes.
A. y = 
B. y = 
C. y = 
D. y = 100 (t - 100)2
Answer: B
Mathematics
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A. x3 + 9x2 + 3x + 27 B. x3 + 9x2 + 27x + 27 C. x3 + 9x2 + 9x + 27 D. x3 + 3x2 + 3x + 27
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A. -3
B. -7
C. 
D. 7
Mathematics