BDC is adjacent (Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap.)
Divide both numbers by 13/90
13/90x = 130
÷13/90 ÷13/90
x= 900
The diameter is 16 so that is the answer<span />
For this case we must find an expression equivalent to:
By definition of power properties we have to meet:

So, rewriting the expression we have:

Answer:
Option B

M= 276 31+276=307.
307-31=276 that’s how I found M