Answer:
Step-by-step explanation:
1st one is x=26
2nd one is x=4
3rd is x=4
4th is x=-1
Hope that helps!
Answer:

Step-by-step explanation:
Cosine is the ratio of the side adjacent to the angle and the right triangle hypotenuse.
B =
= 
Answer:
3/10
Step-by-step explanation: