13. Given the expression 2 2+4-2, what is the value when x=1?
A.2
B.4
c.6
d.8
12.if x=3,what is the value of 3x²?
A.3
B.9
C.18
D.27
11.what is the value of the expression 3 if x=0 and y=1
A.3
B.9
C.18
D.27​

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