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A store is having a 10-hour sale. The total number of shoppers who have entered the store t hours after the sale begins is

A store is having a 10-hour sale. The total number of shoppers who have entered the store t hours after the sale begins is modeled by the function E defined by E (t) = 0.2t4 - 10t3 + 50t2 for 0 t 10. At what rate are shoppers entering the store 4 hours after the start of the sale?

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