A study says that the package flow in the North during the month of May follows x3 f(x) = 3x² 757889x 1 + + , where 1 ≤ x ≤ 31 is the day of the month and 4550 26503750 34 3495000 f(x) is in millions of packages. What is the maximum number of packages delivered in May? On which day are the most packages delivered? Round your final answer to the nearest hundredth.

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