11. If the expression-3 ry - * 'y?+ 1 is evaluated when x = -1 and y = -1, then what is the exact value?
A.-3
B.1
C.-1
0.3
12. What is the value of the expression 3ry if x = 0 and y = 1?
A.O
B.1
C.2
D3
13. If x=3, what is the value of 3x
A3
B.9
C.18
D.27
14. Given the expression 2x + 4x - 2. what is its value whenx=1?
Az
B.4
0.8
15. What is the value of the expression 2ab when a = 1 and b = -2?
B.-2
A-1
C.-3
D.4
C.6​