X-4/3 <= 5
Multiply both sides by 3:
X-4 <= 15
Add 4 to both sides:
X <= 19
The answer is the third one.
The second one because domain refers to x, and since at (-3,-4) the point is hollow, the sign should be < without the line under it
Answer is C.
Law of cosines.
cos-1(-80/240)