The lengths of three sides of a quadrilateral are shown below:Side 1:Side 2:Side 3:

3y² + 2y − 6

3y − 7 + 4y²

−8 + 5y² + 4y

The perimeter of the quadrilateral is 4y³ + 18y² + 16y − 26.

Part A: What is the total length of sides 1, 2, and 3 of the quadrilateral?

Part B: What is the length of the fourth side of the quadrilateral?

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

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