Find the equilibrium values for B and F .
Chemicals enter a house’s basement air. Let F (t ) and B(t ) be the amount of chemical
(in mg m3 ) in the first floor air and the basement air
after t minutes, respectively. Let’s suppose that the rate
of change of F and B are given by the equations:
B'= -0.017B + 0.85 and
F' = 0.015B - 0.0125F
B = 5 mg, F = 6 mg m3
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