Marketing—Advertising Budget: The number of dollars spent on advertising for a product inf...

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 Krypto-Cases sold for a new smartphone 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 cases purchased.

(a) Determine N′(x).

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(b) Compute N(10) and N′(10) and interpret each.