## Thinking Mathematically (6th Edition)

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.