Describe all the numbers that are in the domain of f(z) = √2 + 6z
a. z ≥ 0
b. z ≥ 1/3
c. z ≥ 3
d. z ≤ -3
e. z ≤ 1/3
f. z ≤ 3
g. z ≥ -3
h. z ≥ -1/3
i. all real numbers
j. z ≤ 0
k. z ≤ -1/3