Question 184083
The perimeter is the sum of the triangles sides. 
{{{Perimeter = 3x + (x+19) + (2x +6)}}}
{{{Perimeter = 6x + 25}}}

If x = 5, then
{{{Perimeter = 6*5 + 25}}}
{{{Perimeter = 30 + 25}}}
{{{Perimeter = 55}}} feet