Concept explainers
Grade Inflation. The bar graph shows the percentage of U.S. college freshmen with an average grade of A in high school.
The data displayed by the bar graph can be described by the mathematical model
p=4x5+25,
where x is the number of years after 1980 and p is the percentage of U.S. college freshmen who had an average grade of A in high school. Use this information to solve Exercises 97-98.
a. According to the formula, in 2010, what percentage of U.S. college freshmen had an average grade of A in high school? Does this underestimate or overestimate the percent displayed by the bar graph? By how much?
b. If trends shown by the formula continue, project when 57% of U.S. college freshmen will have had an average grade of A in high school.

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Chapter 1 Solutions
Algebra And Trigonometry 6th. Edition Annotated Instructor's Copy Blitzer
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