Advertising and Sales Revenue A marketing firm wishes to find a function that relates the...

Advertising and Sales Revenue A marketing firm wishes to find a function that relates the sales S of a product and A, the amount spent on advertising the product. The data are

obtained from past experience. Advertising and sales are measured in thousands of dollars.

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(a) Does the relation defined by the set of ordered pairs (A, S) represent a function?

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(b) Draw a scatter diagram of the data.

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(c) Using a graphing utility, find the line of best fit that models the relation between advertising expenditures and sales.

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(d) Interpret the slope.

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(e) Express the relationship found in part (c) using function notation.

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(f) What is the domain of the function?

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(g) Predict sales if advertising expenditures are $25,000.