PLEASE HELP 100 points HURRY The lengths of two sides of a triangle are shown below:

Side 1: 3x - 4x - 1
Side 2: 4x - X+

The perimeter of the triangle is 5x2 - 2x + 3x - 8.

Part A: What is the total length of the two sides, 1 and 2, of the triangle?

Part 3: What is the length of the third side of the triangle?

Part C: Do the answers for Part A and Part B show that the polynomials are closed under addition and subtraction? Justify your answer.