Answer:
f < 12 or f ≥ 15
Explanation:
You want to solve for f the inequalities f - 6 < 6 or f - 4 ≥ 11.
The inequalities are solved separately, and the solutions combined using the conjunction in the problem statement.
f -6 < 6
Add 6 to both sides:
f < 12
f -4 ≥ 11
Add 4 to both sides:
f ≥ 15
The solution is f < 12 or f ≥ 15.