The answer is
D. 4.........
Here u go: D. integer, B.Rational and C. real
By the law of cosines, the angle

satisfies

which reduces to

which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
X is 90 degrees. If AB is the diameter, then it passes through the centre. X is 90 degrees because the angle in a semicircle is always a right angle.
Answer:
Yes
Step-by-step explanation:
Since we are adding two polynomials
The sum will also be polynomial