Concept explainers
a
To draw
a
Explanation of Solution
Given information:
Let
The above table shows sales
Graph:
Interpretation:
Using the graphing utility, the scatter plot for the given data is shown above.
b
To find a quadratic model for the data using regression feature of a graphing utility.
b
Explanation of Solution
Given information:
Calculation:
Using the graphic utility to find the regression,
Insert the data in the table in a grpahic utility to get the following results:
Conclusion:
Therefore, from the above figure., the regression equation for the quadratic model is
c
To draw the graph with the scatter plot from subpart (a) using a graphic utility.
c
Explanation of Solution
Given information:
Graph:
Interpretation:
Using a graphic utility, a parabola is formed when the data is kept on a graph.
d
To find the first year when the office Depot will have sales greater than $14 billion using the model.
d
Answer to Problem 160RE
Explanation of Solution
Given information:
Substitute for the various values of
Conclusion:
Therefore,2007 is the first year when Office Depot will have sales greater than $14 billion.
e
To find if this is the best model for predicting the sakes of Office Depots in future years.
e
Answer to Problem 160RE
Yes
Explanation of Solution
Given information:
When comparing the sales in the table and in subpart (d), the values are almost same in each year. Therefore, this is a good model for predicting the sales of Office Depot in future years.
Conclusion:
Therefore, this is a good model for predicting the sales of Office Depot in future years.
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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