Answer:
Note that the ratio 12 to 3 is said to be equivalent to the ratio 4 to 1, that is 12:3 = 4:1.
 
        
                    
             
        
        
        
28 degrees. This is because the first angle is 12 degrees, the third is x degrees and the second is 5x. You know that in a triangle the angles add up to 180 degrees so 12 + 5x + x = 180. Then you get 6x =168 and x =28 degrees. (**x being the thrid angle**)
        
             
        
        
        
Answer:
X = 6°
Step-by-step explanation:
In a set of parallel lines, the opposite angles and corresponding angles are similar. Since the opposite angle of 110° is the corresponding angle of 19x - 4, you can conclude that 19x - 4 = 110° ⇒ 19x = 114° ⇒ x = 6°.
 
        
             
        
        
        
Answer:
In B)  y = x/7 , the constant of proportionality is 7.
Step-by-step explanation:
Two quantities X and Y are said to be in proportion if and only if 
X = kY   or,  ,
, 
where k =  Proportionality Constant.
Here, 7 is the constant of proportionality. Then, 
A .   y = 14x
here,  ≠ 7
  ≠ 7
B .   y = x/7
here,  = constant of proportionality .
  = constant of proportionality .
C.   y = x
here,  ≠ 7
  ≠ 7