P is the amount of certain substanc left...

P is the amount of certain substanc left in after time t. If the rate of evaporation of the substance is proportional to the amount remaining, then

`P = ce^(kt)`

`P = ce^(-kt)`

`P= ckt`

`Pt = c`

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PREMIERS PUBLISHERS-ORDINARY DIFFERENTIAL EQUATIONS -SOLUTION TO EXERCISE 10.9

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