Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - 6.3 Applications of Linear Equations - Exercise Set 6.3 - Page 374: 24

Answer

The year is 2020.

Work Step by Step

Consider the provided condition. It shows that the average decrease in the percentage is 1.7% each year and the initial percentage is 45%. So, for 11% the provided condition can be formulated as, $45-1.7x=11$ Here, x shows the number of years after the year 2000. Now, solve the above equation. $\begin{align} & 45-1.7x=11 \\ & -1.7x=11-45 \\ & x=\frac{-34}{-1.7} \\ & =20 \end{align}$ The above equation has x as the number of year after the year 2000. So the year in which the percentage will be 11% is, $2000+20=2020$ Thus, 11% of all American adults will believe that most qualified students get to attend the college by the year 2020.
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