Answer:
Step-by-step explanation:
I don't say you must have to mark my ans as brainliest but if you think it has really helped you plz don't forget to thank me my frnd...
Answer: 
Step-by-step explanation:
In order to find the value of "x", it is important to remember that:

We can identify in the figure that:

Then:

Solving for AB:

Now, since there are 360° in a circle, we know that:

Then we can substitute
into
and solve for "x". This is:

Answer:
tan A = 5/12
Step-by-step explanation:
To find tangent of a triangle, it is this ratio : opposite / adjacent.
Knowing that "A" is the given angle, 5 is the opposite and 12 is the side adjacent to "A". Putting these values together, the tangent is
5 (opposite)/12 (adjacent).
Hope this helps!
Brother=b
b+9=11
b=2
2=1/5a
10=a
a=10
The answer is 10
Hope this helps :)