Not sure for (b)
Step-by-step explanation:
(a)55+80+x=180 (angles inside the triangle)
135+×=+180
x=180-135
x=45
 
        
             
        
        
        
Answer:
OPTION D
Step-by-step explanation:
We have to determine which option determines the function given above.
To determine the function, just substitute the values and compare LHS and RHS. 
we have 



Here,  is the domain and
 is the domain and  is the co-doamin.
 is the co-doamin.
Therefore, 
Now, OPTION A: 
Substitute x = 4. We get f(x) = 3  18.
 18.
So, OPTION A is rejected.
Similarly, OPTION B: 
Substitute x = 4. We get f(4) = 22  18.
18.
It is rejected as well.
Now, for OPTION C: 
Substitute x = 4. We get f(4) = -3  18.
 18.
So, OPTION C is also rejected.
OPTION D: 
Substitute x = 4. We get f(4) = 18.
Substitute the remaining points in domain as well. We notice that it exactly matches the given function. So, OPTION D is the answer.
 
        
             
        
        
        
Answer:
94° 
Step-by-step explanation:
it is a similar triangle and corresponding angles of similar triangles are equal. and interior angles of triangles always equal to 180° 
 
        
                    
             
        
        
        
The Vertical angle for <HKJ is <OKL or #12