In Exercises 77-80, a linear function that models data is described. Find the slope of each model. Then describe what this means in terms of the rate of change of the dependent variable per unit change in the independent variable. 77. The linear function f(x) = 55.7x + 60.1 models the number of smartphones sold in the United States, f(x), in millions, x years after 2006. (Source: Newsweek, April 11, 2011) 78. The linear function f(x) = 2x + 10 models the amount, f(x), in billions of dollars, that the drug industry spent on marketing information about drugs to doctors x years after 2000. (Source: IMS Health) 79. The linear function f(x) = -0.52x + 24.7 models the percentage of U.S. adults who smoked cigarettes, f(x), x years after 1997. (Source: National Center for Health Statistics) 80. The linear function f(x) = -0.28x + 1.7 models the percentage of U.S. taxpayers who were audited by the IRS, f(x), x years after 1996. (Source: IRS)

In Exercises 77-80, a linear function that models data is described. Find the slope of each model. Then describe what this means in terms of the rate of change of the dependent variable per unit change in the independent variable. 77. The linear function f(x) = 55.7x + 60.1 models the number of smartphones sold in the United States, f(x), in millions, x years after 2006. (Source: Newsweek, April 11, 2011) 78. The linear function f(x) = 2x + 10 models the amount, f(x), in billions of dollars, that the drug industry spent on marketing information about drugs to doctors x years after 2000. (Source: IMS Health) 79. The linear function f(x) = -0.52x + 24.7 models the percentage of U.S. adults who smoked cigarettes, f(x), x years after 1997. (Source: National Center for Health Statistics) 80. The linear function f(x) = -0.28x + 1.7 models the percentage of U.S. taxpayers who were audited by the IRS, f(x), x years after 1996. (Source: IRS)

Algebra and Trigonometry (6th Edition)

6th Edition

ISBN:9780134463216

Author:Robert F. Blitzer

Publisher:Robert F. Blitzer

ChapterP: Prerequisites: Fundamental Concepts Of Algebra

Section: Chapter Questions

Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...

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