Solution :
Given that, The perimeter of the cabin is the sum of all four sides and can be written as perimeter = 2a+2b.
From the given diagram,
[tex]a = x+6[/tex]
and, [tex]b = x+4[/tex]
The perimeter of the cabin
[tex] =2a+2b\\= 2(x+6)+2(x+4)\\=2x+12+2x+8 \\=4x+20\\=4(x+5)[/tex]
Hence, an expression in terms of x that shows the total perimeter [tex]=4(x+5)[/tex]