Copyright © 2011 Pearson, Inc. 1.7 Modeling with Functions.

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Presentation transcript:

Copyright © 2011 Pearson, Inc. 1.7 Modeling with Functions

Copyright © 2011 Pearson, Inc. Slide What you’ll learn about Functions from Formulas Functions from Graphs Functions from Verbal Descriptions Functions from Data … and why Using a function to model a variable under observation in terms of another variable often allows one to make predictions in practical situations, such as predicting the future growth of a business based on data.

Copyright © 2011 Pearson, Inc. Slide Example A Maximum Value Problem

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Example Finding the Model and Solving Grain is leaking through a hole in a storage bin at a constant rate of 5 cubic inches per minute. The grain forms a cone-shaped pile on the ground below. As it grows, the height of the cone always remains equal to its radius. If the cone is one foot tall now, how tall will it be in one hour?

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Constructing a Function from Data Given a set of data points of the form (x, y), to construct a formula that approximates y as a function of x: 1.Make a scatter plot of the data points. The points do not need to pass the vertical line test. 2.Determine from the shape of the plot whether the points seem to follow the graph of a familiar type of function (line, parabola, cubic, sine curve, etc.). 3.Transform a basic function of that type to fit the points as closely as possible.

Copyright © 2011 Pearson, Inc. Slide Example Curve-Fitting with Technology The table shows that the number of patent applications in the United States increased from 1993 to Find both a linear and a quadratic regression model for this data. Which appears to be the better model of the data?

Copyright © 2011 Pearson, Inc. Slide Solution Use a grapher to compute the linear and quadratic regression, using x = 0 for 1993, x = 1 for 1994, … The linear regression model is y = 19.23x The quadratic regression model is y = x x The quadratic regression equation appears to model the data better than the linear regression equation.

Copyright © 2011 Pearson, Inc. Slide Functions

Copyright © 2011 Pearson, Inc. Slide Functions (cont’d)

Copyright © 2011 Pearson, Inc. Slide Quick Review

Copyright © 2011 Pearson, Inc. Slide Quick Review Solutions

Copyright © 2011 Pearson, Inc. Slide Chapter Test

Copyright © 2011 Pearson, Inc. Slide Chapter Test

Copyright © 2011 Pearson, Inc. Slide Chapter Test

Copyright © 2011 Pearson, Inc. Slide Chapter Test Solutions

Copyright © 2011 Pearson, Inc. Slide Chapter Test Solutions

Copyright © 2011 Pearson, Inc. Slide Chapter Test Solutions

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