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Let represent the number of croissants sold at a small cafe on a given day, . Use shifts of the function to find a formula for each of the following functions in terms of . Be sure to use capital letters where appropriate.

a) , the number of muffins sold at the cafe on day , is remarkably always 5 more than the number of croissants sold on day .

b) , the number of croissants the bakers plan to make on day , is equal to the number of croissants sold on the same day of the week the week before.