Answer:
E. x-coordinate of point C
Step-by-step explanation:
Consider the diagram of the unit circle which has been drawn and attached.
Using a calculator in radians, 
On the unit circle, out of points A, B and C, the point -1 is at point C.
Point C is located at (-1,0).
Therefore,
is the x-coordinate of point C.
The correct option is E.
The answer to this is 4000
Estimating 495 would be 500 and estimating 254 would be 300. Then just add them and you'll get 800.