The following table shows the daily receipts in millions of dollars of the movie "Avatar" for successive Fridays after its opening on Friday, December 18th, 2009. Weeks Receipts (millions of $) 1 4 7 10 13 16 19 22 25 28 75.617 42.785 22.85 13.655 4.027 0.844 0.633 0.188 0.064 0.028 Use a central difference to estimate the instantaneous rate of change of daily receipts 4 weeks after opening day. million dollars/week

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