Concept explainers
a.
To write:The total area A of play areas of child-care centers as a function of ‘x’ .
a.

Answer to Problem 60E
The total area of the child-care center as a function of ‘x’ is
Explanation of Solution
Given:
The view of child care center is shown in Figure-1. Total fencing of the center is 200 feet.
Formula/ concept used:
Area of rectangle is A= length
Calculations:
The total fencing of child-care center
Total area of the center
Thus, total area of the child-care center as a function of ‘x’ is
Conclusion:
The total area of the child-care center as a function of ‘x’ is
b.
To create:A table showing possible values of “x ” and the corresponding total area A of the plays areas, and estimate dimensions that will produce the maximum enclosed area.
b.

Answer to Problem 60E
The total enclosed area of child-care center is maximum
Explanation of Solution
Given:
The expression for total area of the play areas as function of x :
Concept used:
We choose values of x arbitrarily such that A is positive.
Calculations:
The expression for Ais
The table for total area of the play areas A and x is given below:
x (in feet) | 5 | 10 | 15 | 20 | 25 | 30 | 35 |
A(in sq. ft) | 900 | 1600 | 2100 | 2400 | 2500 | 2400 | 2100 |
From the table, we observe that total area A is maximum
For
Thus, the total enclosed area of child-care center is maximum
Conclusion:
The total enclosed area of child-care center is maximum
c.
To approximate:The dimensions of child-care center so that total play area is maximum, using graphing utility.
c.

Answer to Problem 60E
Using graphing utility, the total area
Explanation of Solution
Given:
The expression
Method used:
We use graphing calculator.
Graph:
The graph of A versus x is shown in Figure-2 here.
We see that the total area
Conclusion:
Using graphing utility, the total area
d.
To write:The area
d.

Answer to Problem 60E
The total area
Explanation of Solution
Given:
The area function
Formula used:
The standard form of quadratic function that represent a parabola is
Calculations:
The areafunction is
Thus,
Since,
Conclusion:
The total area
e.
To compare: The results from parts (b), (c), and (d).
e.

Answer to Problem 60E
The results obtained parts (b), (c), and (d) are identical.
Explanation of Solution
Given:
The results obtained in parts (b), (c), and (d).
Explanations:
In parts (b), (c), and (d) we find that the area
Thus, the results obtained parts (b), (c), and (d) are identical.
Chapter 2 Solutions
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