Answer:2.21
Step-by-step explanation:I used a calculator
Answer:
Below.
Step-by-step explanation:
Part A: 
Part B: Degree = 2, Classification = Quadratic
Part C: The polynomial is closed because it is multiplied. You CANNOT close under division.
A polygon has as many angles as it has sides.
3x - 12
3(3x/3 - 12/3)
3(x - 4)
The answer is: 3(x - 4).