Answer:
B= 90
C= 80
D= 100
Step-by-step explanation:
So let’s start with the bottom angles.
We know that the adjacent angles in a parallelogram add up to 180° so our equation would be  . So let’s simplify it b and b are both the same variables so we will get 2b and -10 + 10 is 0 so we get the following equation
. So let’s simplify it b and b are both the same variables so we will get 2b and -10 + 10 is 0 so we get the following equation  .
. 
So now we divide 180 and 2 and we get 90 as b.
So one side will be 100 because of the +10 and the other 90 because of the -10.
Now for the next side.

So we know that b+10 is adjacent to c so 180-100 is 80, so 80 is c.
Now for d.
b-10 is 80 so 180-80 is 100, so d is 100.
 
        
             
        
        
        
Answer:
11). x = 25.8°
12). x = 67.3°
Step-by-step explanation:
11). By using sine rule in the given triangle,
    cos(x) = 
    cos(x) = 
    x = 
    x = 25.84
    x ≈ 25.8°
12). By applying tangent rule in the given triangle,
     tan(x) = 
     tan(x) = 
     x = 
     x = 67.29°
     x ≈ 67.3°  
 
        
             
        
        
        
(2,4)
Step-by-step explanation:
I'm not sure in the slightest but with the formula I learned I think this is correct