The vertices of a sandbox are p(12,14), q(12,17), r(16,17), and s(16,14). the coordinates are measured in feet. what is the perimeter of the sandbox ?

First, you need to draw this out. Roughly, it should look a little something like the link i included in this answer. then u just draw a line tracing the points to make a rectangle (sandbox) and decide that the perimeter, or the distance around, would be 3+4+3+4 = 14 feet.