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: 23


By the year 2015.

Work Step by Step

Consider the provided condition. It shows that the average increase in the percentage is 2.4 each year and the initial percentage is 31%. So, for 67% the provided condition can be formulated as, $31+2.4x=67$ Here, x shows the number of years after the year 2000. Now, solve the above equation. $\begin{align} & 31+2.4x=67 \\ & 2.4x=67-31 \\ & x=\frac{36}{2.4} \\ & =15 \end{align}$ The above equation has x as the number of year after the year 2000. So the year in which the percentage will be 67% is, $2000+15=2015$ Thus, 67% of all American adults will view a college education as essential for success by the year 2015.
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