Answer:
answer b is b=2c+a okay it is right answer
The answer is 2.
You would replace the letters with number which it would be 10/5
Wait what’s the question?
Answer:
What is it?
Step-by-step explanation:

The cosine function is negative in 2nd and 3rd quadrants, So you know that you will have 2 solutions. One between pi/2 and pi, the other between pi and 3pi/2.
Refer to a unit circle to find that

Final Answer: