Solve the problem.The mass of a liquid varies directly as its volume V. If the mass of the liquid in a cubical container 5 cm on a side is 250 g, find the mass of the liquid in a cubical container 3 cm on a side.
A. 27 g
B. 6 g
C. 12 g
D. 54 g
Answer: D
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Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 4(50 + t) - 
B. y = 4(50 + t) - 
C. y = 2(100 + t) - 
D. y = 2(100 + t) - 
Provide an appropriate response.A swimming pool owner has two solutions which contain different concentrations of chlorine. One is a 5% solution and the other is a 10% solution. How many liters of each should she mix to obtain 8 liters with a 6% concentration?
What will be an ideal response?
Solve the problem.A country has a population growth rate of 2.4% compounded continuously. At this rate, how long will it take for the population of the country to double? Round your answer to the nearest tenth.
A. 30 years B. .29 years C. 28.9 years D. 2.9 years
Multiply.-9 ? (-10) ? (-5) ? 10 ? (-9)
A. 40,500 B. -40,500 C. -23 D. -4,491