7. If a = 3 and b = -1, find the value of 2a - 2b. A. -8
B.-4
C. 4
D. 8
8. Evaluate: 2x2y, when x = -3 and y = 5
A-90 B. -30 C. 30
D. 90
Find the value of 4(m-n) if m= 5 and n = -1.
A. 36
B. 24
C. 12
D. -12
10. What will be the value of x²+ y? if x = 4 and y = 2 ?
x-y
C. 8
A. 1
B. 4
D. 10
11. Which of the following is NOT a polynomial?
B. 1
C. V5 xy
A. 5
D.
3a
12. Which of the following is a trinomial?
A. 3x3
C. 4(a+1)
B. -8xyz
D. a+b+c​