question archive The population of the city of Bingville increases at a rate proportional to the numbers of its inhabitants present at any time t
The population of the city of Bingville increases at a rate proportional to the numbers of its inhabitants present at any time t
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The population of the city of Bingville increases at a rate proportional to the numbers of its inhabitants present at any time t. If the population of Bingville was 30,000 in 1970 and 35,000 in 1980, what will be the population of Bingville in 1990?
Alarge tank initially contains 200 gal of brine in which 15 Ib of salt is dissolved. Starting at t=0,
brine containing 4lb of salt per gallon flows into the tank at the rate of 3.5 gal/min. The mixture
is kept uniform by stirring and the well-stirred mixture leaves the tank at the rate of 4 gal/min.
a. How much salt is in the tank at the end of one hour?
b. How much salt is in the tank when the tank contains only 50 gal of brine?
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