Chapter 2 - Graphs and Functions - 2.1 Rectangular Coordinates and Graphs - 2.1 Exercises - Page 194: 43

$$\color{blue}{$23,428}$$

Since $2012$ is the midpoint between $2011$ and $2013$ we will use the two values, $23,021$ and $23,834$, as our endpoints in the midpoint formula: $${(\frac{x_{a}+x_{b}}{2},\frac{y_{a}+y_{b}}{2})}=M$$ $${(\frac{2011+2013}{2},\frac{23021+23834}{2})}=M$$ $${(\frac{4024}{2},\frac{46855}{2})}=M$$ $$(2012,23427.5)=M$$ $$\color{blue}{$23,428}$$