
Concept explainers
a
To draw
a

Explanation of Solution
Given information:
Let
The above table shows the annual sales S (in billions of dollars) of pharmacies and drug stores in United States from 2007 through 2012.
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 use the model and estimate the first year when the annual sales of pharmacies and drug stores will be less than $200 billion.
d

Answer to Problem 18E
Yes, it is a good model.
Cannot be found
Explanation of Solution
Given information:
Refer to the graph in subpart (c).
With the help of the equation
On Substituting
It is observed that the same values as in the table occurs for different values of
The first year when annual sales will be less than $200 billion cannot be determined.
Conclusion:
Therefore, this is a good model for predicting the future sale of pharmacies and drugs in United States.
Chapter 2 Solutions
Precalculus with Limits: A Graphing Approach
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