Answer:
(-4,0)
Step-by-step explanation:
We start at the origin (where the lines cross)
We will go left 4 units. That is the x coordinate (-4)
We go up 0. That is the y coordinate
(x,y)
C = (-4,0)
Saying arccos(-√2/2) is the same as saying cos(x)=-√2/2. This is one the trigonometric values you should have memorized if you are taking a a trig class. In order to get √2/2, x must be equal to 45° or pi/4. But since it is a negative √2/2, the answer would be -45°or -pi/4.
There are technically multiple answers to this, but since you weren't given a range for the answers, I would stick with -45°.
Hope this helps
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