z/4 + 5 >= 5.5
-5 -5 subtract 5 from both sides
z/4 >= 0.5
x4 x4 times both sides by 4
z >= 2.0
z/4 + 5 ≥ 5.5
subtract 5 from each side
z/4 ≥ .5
multiply by 4
z≥ 2
