Question 1201825
<pre>
I think you meant the "m" to be for "meters" (or "metres" if you are from UK).

Think of the word "perimeter" as "peRIMeter".  See the word "RIM" inside? lol
Think of the perimeter as the RIM.

{{{drawing(400,400*7/9,-2,7,-2,5,

line(0,0,5,0), line(5,0,5,3), line(5,3,0,3), line(0,3,0,0),

locate(2.3,0,x-6), locate(2.3,3.4,x-6), locate(-.9,1.7,2x+3),

locate(5.1,1.7,2x+3) )}}}

PERIMETER = DISTANCE ALL THE WAY AROUND THE RIM

PERIMETER = TOP SIDE + LEFT SIDE + BOTTOM SIDE + RIGHT SIDE

PERIMETER =  (2x+3)  +   (x-6)   +   (2x+3)    +   (x-6)

          =       2x + 3 + x - 6 + 2x + 3 + x - 6

          =       2x + x + 2x + x + 3 - 6 + 3 - 6

          =                6x - 6  meters

Edwin</pre>