Van purchased a DVD player on sale. The original selling price was
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The model would take the form of
So in 2015, when
, the population would be
On the other hand, you could use the following discrete model for the population, which gives a similar result. If
corresponds to the year 2000, then in 2001, when 
, you have
In the next year,
And so on, making the general pattern for the
th year to be
This means in the year 2015, or when, the population should be approximately
So in 2015, when
On the other hand, you could use the following discrete model for the population, which gives a similar result. If
In the next year,
And so on, making the general pattern for the
This means in the year 2015, or when