SOLUTION:
The points D and E are located at;
D is located -1.8
E is located at 2.4
Therefore, the distance from D to E is;
[tex]\begin{gathered} x_2-x_1=2.4-(-1.8)=2.4+1.8 \\ =4.2 \end{gathered}[/tex]
The midpoint is given by;
[tex]\begin{gathered} \frac{x_2+x_1}{2} \\ =\frac{2.4+(-1.8)}{2} \\ =0.3 \end{gathered}[/tex]
