Concept explainers
(a)
To graph: the approximate number of students (in millions) enrolled in public schools of U.S from 2009 to 2016.
(a)

Explanation of Solution
Given information: The mathematical model for the number of students (in millions) enrolled in public schools of U.S from 2009 to 2016 is:
Where t is the year, with
Calculation:
The table for the approximate number of students (in millions) enrolled is given below:
Year (t ) | Number of students |
2009 | 66.95 |
2010 | 68 |
2011 | 68.35 |
2012 | 68 |
2013 | 67.141 |
2014 | 66.392 |
2015 | 66.375 |
2016 | 65.968 |
The above data can be graphically shown as:
(b)
whether the
(b)

Explanation of Solution
Given information: The mathematical model for the number of students (in millions) enrolled in public schools of U.S from 2009 to 2016 is:
Where t is the year, with
The given mathematical model is piecewise defined for the years 2009 to 2012 and 2013 to 2016.It can be seen from the graph that number of students enrolled in these years comes under the range 60 and 70(in millions).
If there is no change in the rate of number of students enrolled in the years outside the domain, then the given mathematical model can be used for
Chapter 1 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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