6. What is the value of x2 + 2x + 4 if x = 3?
A 16
B.17
C. 18
D. 19
7. Which of the following is the value of the algebraic expression 3x + y if x = 4 andy = 2?
A 20
B. 30
C 40
D.50
8. What is the sum of 2x2 - 5x and 4x?
A 93
B 2x2 - 9x
C. 8x² + x
D. 2x² - x
9. What is the difference when 6x - 2y is subtracted from 8x + 4y?
A. 2x - 6y
B. 2x + 6y
C. - 2x - 2y
D. 2x+2y
10. Which of the following must be subtracted from 2a - 4b to get 5a + 8b?
B. - 3a - 12b
C. 7a + 4b
A 3a + 12b
D. -7a-4b​