Answer:
[tex]25x-1[/tex]
Step-by-step explanation:
[tex]Perimeter\ is\ just\ the\ total\ length\ of\ the\ boundary\ of\ a\ polygon.\\It\ can\ be\ calculated\ by\ just\ adding\ all\ the\ corresponding\ sides\ of\ a\ polygon\ together.\\Here,\\Length\ of\ the\ 1st\ side=(3x+7)\\Length\ of\ the\ 2nd\ side=20x\\Length\ of\ the\ 3rd\ side=2(x-4)\\=2x-8\\Hence,[/tex][tex]The\ perimeter\ of\ the\ triangular\ park=(3x+7)+20x+2(x-4)\\=3x+7+20x+2x-8\\=3x+20x+2x+7-8[/tex]
=25x-1
