Marketing—Advertising Budget: The number of dollars spent on advertising for a product influences the number of items of the product that will be purchased by customers. The number of Find-it-Now GPS devices is a function of the amount spent on advertising and can be modeled by
where x represents the amount spent on advertising, measured in thousands of dollars, and N(x) represents the number of devices purchased.
(a) Determine N′(x).
(b) Compute N(5) and N′(5) and interpret each.
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