An airplane is flying at analtitude of 13,034feet. If another airplane is flyingat 18,002 feet, find the verticaldistance between the planes.

Notice that the two airplanes are flying above the ground; therefore, the position of the first aircraft is given by y_1=13034, while the position of the second one is y_2=18002.
The distance between two points is given by
[tex]|y_2-y_1|[/tex]Thus,
[tex]\Rightarrow distance=|y_2-y_1|=|18002-13034|=|4968|=4968[/tex]