Answer:
X+2/3
Step-by-step explanation:
YOU TAKE THE PROBLEM AND FLIP IT AND YOU GET X+2/3
f(0) = 1/2
At x=0, the inequality tells you ...
1/2 ≤ 1 -f(0) ≤ 1/2
That is, ...
1 - f(0) = 1/2
the answer is letter d