135.9 rounded to the nearest tenth
It is asking for the tangent ratio at B.
In my answer; angle=theta
tan(theta)=opposite/adjacent
tan(theta)= 3/2
Answer:
This can be found by using the permutations and combinations formuals.
Combinations being the C equation and Permutations being the P equation.

Explanation:
A permutation is used for the list of data (where the order of the data matters) and the combination is used for a group of data (where the order of data doesn't matter).
1/10 of .9 is the same as dividing .9 by 10.
.90 / 10 = .09
.09 is the answer
at least 4 different angles are present