The following results are;
- The total length of the two sides is
. - The length of the third side is
. - Yes, Part A and Part B show that the polynomials are closed under addition and subtraction.
<h3>What is the triangle?</h3>
Triangle is a polygon that has three sides and three angles. The sum of the angle of the triangle is 180 degrees.
In a triangle, the sides and perimeter are given.

a. The total length of the two sides will be

The total length of the two sides is
.
b. Then a length of the third side (y) will be

On solving for y, we have

The length of the third side is
.
c. Yes, Part A and Part B show that the polynomials are closed under addition and subtraction.
More about the triangle link is given below.
brainly.com/question/25813512