4. What is the coefficient of the 2nd term in 3x2 + 4x + 5?
a. 2
b. 3
c.4
d. 5
5. Which of the following is a polynomial?
a. 4x² + 2x + 5
b. 4x-2 + 2x + 4 + 2?
c.3-×+2?
d. 3x + 4y-2