Number 4 is the question answer quickly how can i represent that in a pie chart

Step-by-step explanation:

draw a circle divide evenly and place in evenly

A) 5x² + 7x - 4

B) 5x³ - x² - 8x + 1

C) Yes, polynomial are closed under addition and subtraction. This means that after subtraction or addition of two polynomials, new polynomial is obtained, as was seen in part A and part B

Step-by-step explanation:

A) total length of the two sides = side 1 + side 2 =  

3x² − 2x − 1

+

2x² + 9x  − 3

5x² + 7x - 4

B) Perimeter = side 1 + side 2 + side 3

side 3 = Perimeter - (side 1 + side 2) =

5x³ + 4x² − x − 3

-

        5x² + 7x - 4

5x³ - x² - 8x + 1