Concept explainers
(a)
Use the
(a)
Answer to Problem 41PPS
20% of the population will have high − speed Internet in 1993 and 2023.
Explanation of Solution
Given:
The percent of U.S. households with high − speed internet h can be estimated by
Use the quadratic Formula to determine when 20% of the population will have high − speed Internet.
Concept Used:
Use the quadratic Formula to determine when 20% of the population will have high − speed Internet.
Translate the statement into a quadratic equation:
Calculation:
Write the equation in standard form:
Now solve for n by using the Quadratic Formula:
For this equation:
Since n is the number of years since 1990 add the solutions to 1990.
Thus, 20% of the population will have high − speed Internet in 1993 and 2023.
(b)
Explain that this quadratic equation a good model for this information.
(b)
Answer to Problem 41PPS
66 % of the population would ever have high − speed Internet.
Explanation of Solution
Given:
The percent of U.S. households with high − speed internet h can be estimated by
Is a quadratic equation a good model for this information? Explain.
Concept Used:
A quadratic equation is not a good model for this information.
Calculation:
A quadratic equation is not a good model for this information.
The parabola has a maximum at about 66, meaning only 66 % of the population would ever have high − speed Internet. | Graph of the equation:
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Chapter 9 Solutions
Algebra 1
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