
a.
To identify:
The transformation of parent function f(t)=t2 .
a.

Answer to Problem 65E
The transformation of parent function f(t)=t2 .is as below:
- Horizontal shift of 26.17 units to right.
- Vertical shrink of 0.03 units.
- Reflection about the t− axis.
- Vertical shrink of 126.5 units upwards.
Explanation of Solution
Give information:
Given:
N(t)=0.03(t−26.17)2+126.5 .
Calculation:
The numbers N(in millions) of house hold from 2000 to 2013 are given.
Model for the given data is ,
N(t)=0.03(t−26.17)2+126.5
Where
t=0 represents 2000 .
The parent function of the given function f(t)=t2 ,
To get the graph of y=f(x−c) , shifts graph of y=f(x) a distance c units to right.
To get the graph of y=cf(x) , shrink graph of y=f(x) vertically by a factor of 0<c<1 .
To get the graph of y=−f(x) , reflect the graph of y=f(x) about x− axis.
To get the graph of y=f(x)+c , shift the graph of y=f(x) a distance c units upwards.
Thus, transformation of N(t)=−0.03(t−26.17)2+126.5 from f(t)=t2 is obtained by,
- Horizontal shift of 26.17 units to right.
- Vertical shrink of 0.03 units.
- Reflection about the t− axis.
- Vertical shrink of 126.5 units upwards.
b.
To Graph:
Model and given data in the same viewing window.
b.

Explanation of Solution
Give information:
Given:
N(t)=0.03(t−26.17)2+126.5 .
Graph:
Interpretation:
Graph model and given data points using graphing utility is as above.
c.
To calculate:
Function so that t=0 represents 2009 .
c.

Answer to Problem 65E
Required function is G(t)=−0.03(t−17.17)2+126.5
Explanation of Solution
Give information:
Given:
N(t)=0.03(t−26.17)2+126.5 .
Calculation:
If t=0 represents 2009 , then to fit the data there will be a horizontal shift of 9 units to the left and so the new functioncan be get from N(t) as,
G(t)=N(t+9)G(t)=−0.03(t−26.17)2+126.5G(t)=−0.03(t−17.17)2+126.5
Required new function is,
G(t)=−0.03(t−17.17)2+126.5
Chapter 1 Solutions
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