The rate of weekly sales of a product that has just been released can be modelled by the following differential equation

where is the number of sales in thousands and is the number of weeks since launch.

Good quality products will result in increasing sales.

1. Find the function that describes the weekly sales.   (2 marks)
   

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2. By calculating the number of sales for the first and fifth week, comment on the results of the launch with respect to the given information.  (2 marks)
   

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