Mathematics, 04.07.2020 18:01 melody32

A company estimates that it will sell N(x) units of a product after spending $x thousand on advertising, as given by N(x)equalsnegative 0.25 x Superscript 4 Baseline plus 22 x cubed minus 472.5 x squared plus 76 comma 000, where 21 less than or equalsxless than or equal 45. When is the rate of change of sales increasing and when is it decreasing

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