Let:
[tex]\begin{gathered} (x1,y1)=(15,-11) \\ (x2,y2)=(42,-11) \end{gathered}[/tex]
Using the distance formula:
[tex]\begin{gathered} d=\sqrt[]{(x2-x1)^2+(y2-y1)^2} \\ d=\sqrt[]{(42-15)^2+(-11-(-11))^2} \\ d=\sqrt[]{27^2} \\ d=27 \end{gathered}[/tex]
Answer:
27 units
