Unformatted text preview: . 009 e âˆ’ . 0005 Â· 60 = 0 . 001 + 0 . 009 e âˆ’ . 03 â‰ˆ . 0097 % . To answer the second question, we solve the equation c ( t ) = 0 . 001 + 0 . 009 e âˆ’ . 0005 t = 0 . 002 â‡’ t = ln(1 / 9) âˆ’ . 0005 â‰ˆ 4394 . 45 (min) â‰ˆ 73 . 24 (h) . 7. Let x ( t ) denote the mass of salt in the Frst tank at time t . Assuming that the initial mass is x (0) = x , we use the mathematical model described by equation (1) on page 90 of the text to 106...
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 Spring '10
 Hald,OH
 Math, Differential Equations, Linear Algebra, Algebra, Equations

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