Math test

Name:

1.4x+6=18,solve for x.

x=16
x=3
x=5

2.Solve, 10 × ½

x=5
x=10/2
x=15

3.3x ≥ 12,Solve for x.

x ≥ 6
x ≤ 4
x ≥ 4
In the problem,2x=14, what is x?How do you know?