Concept explainers
Application Exercises
The bar graphs show changes in educational attainment for Americans ages 25 and older from 1970 to 2007. Exercises 61–62 involve developing arithmetic sequences that model the data.
In 1970, 55.2% of Americans ages 25 and older had completed four years of high school or more. On average, this percentage has increased by approximately 086 each year.
a. Write a formula for the nth term of the arithmetic sequence that models the percentage of Americans ages 25 and older who had or will have completed four years of high school or more nyears after 1969.
b. Use the model from part (a) to project the percentage of Americans ages 25 and older who will have completed four years of high school or more by 2019.
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Introductory and Intermediate Algebra for College Students
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