The expression 17n + 11 represents the perimeter (in feet) of the triangle. Write an expression that represents the measure of the third side. On either side of the triangle, there are two expressions, one being 5n + 6 and 4n + 5.

Answer 1

perimeter-side1-side2=third side
17n+11-(5n+6) -(4n+5)= third side

Answer 2

The answer is 8n, I don't know how to explain. I kind of figured it out in my head somehow.