
Concept explainers
a.
To find
a.

Answer to Problem 8RE
The answer is
Explanation of Solution
Given:
The expression E(x) is given.
Concept Used:
The concept of functions is used.
Calculation:
The expression of E is
To find E (2000), put x=2000 in the above expression.
To find E (15000), put x=15000 in the above expression.
Conclusion:
Hence, the answer is
b.
To write what the answers in part (a) represent.
b.

Answer to Problem 8RE
The E (2000) in the above part represent her earning for the week if she sells 2000 dollars’ worth of goods.
The E (15000) in the above part represent her earning for the week if she sells 15000 dollars’ worth of goods.
Explanation of Solution
Given:
The expression
Concept Used:
The concept of functions is used.
The expression
Conclusion:
The E (2000) in the above part represent her earning for the week if she sells 2000 dollars’ worth of goods.
The E (15000) in the above part represent her earning for the week if she sells 15000 dollars’ worth of goods.
c.
To find out E (0).
c.

Answer to Problem 8RE
The E (0) = 400 which represents fixed cost.
Explanation of Solution
Given:
The expression
Concept Used:
The concept of functions is used.
Calculation:
To calculate E(0), put x=0,
Conclusion:
So, E (0) = 400 which represents fixed cost.
d.
To find out the percentage Reynalda earns on the goods that she sells.
d.

Answer to Problem 8RE
The answer is 3 percent.
Explanation of Solution
Given:
The expression
Concept Used:
The concept of percentage and functions is used.
Calculation:
To calculate percentage multiply the coefficient of x by 100,
Conclusion:
So, the answer is 3 percent.
Chapter 2 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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