Consider the following data:

The percent p of high school seniors who use marijuana daily is given by the equationwhere x is the number of years after 1990.

And suppose this model is accurate.

Let us find the range of years for which the percent of use is 3.2%-7%.

First, we find for 3.2%.

To do this, substitutefor p in the equation.

Then,

Since x is the number of years after 1990. So,

So, 3.2% of high school seniors use marijuana daily in the year.