Answer:
42º
Step-by-step explanation:
90-48=42
Let me start from the meaning of half plane.you must have learned that there are two axes X and Y axes which includes positive X axes and negative X axes and there is positive Y axes and negative y axes. So there are four quadrants which i have explained in the figure. I have explained the meaning of Half plane in the Diagram also. Half plane=Figure obtained by covering any two adjacent regions of the coordinate axes.So we get four half planes.
Now your question is k is a half plane determined by QR, such that 0<x≤180 and there is exactly one ray QRP that lies in k
So, 
Answer: Yes
Step-by-step explanation:
Answer:
[-4, infinity)
Step-by-step explanation:
the smallest possibly for a is -2 and if you add 2 to 12 you get b=14 so the smallest out can be is 14 and it can be any number higher because it with still be greater