Answer:
The perimeter in units of the model is [tex](86x+24)\ units[/tex]
Step-by-step explanation:
we know that
The perimeter of the figure is equal to the perimeter of the rectangle plus the the length sides of the legs of the isosceles triangle
so
[tex]P=2(17x+8)+2(21x+5)+2(5x-1)\\ \\P=(34x+16)+(42x+10)+(10x-2)\\ \\P=(86x+24)\ units[/tex]
