Chapter 1 - Section 1.1 - Functions from the Numerical, Algebraic, and Graphical Viewpoints - Exercises - Page 53: 41a

$s(1)=3.8$ $s(4)=4.0$ $s(5)=4.1$ In 2006 the petrochemical sales in Mexico was 3.8 billion metric tons. In 2009 the petrochemical sales in Mexico was 4.0 billion metric tons. In 2010 the petrochemical sales in Mexico was 4.1 billion metric tons.

The table shows that $s(1)=3.8$ $s(4)=4.0$ $s(5)=4.1$ The table shows annual petrochemical sales in Mexico for 2005-2010. We interpret our answers based on that.