Well assuming that this would be a typical triangle, and not a right angle one, knowing that the sum of all sides adds up to 180 degrees, simply add all of the expressions and one value and make it equal to 180, and then solve for x. 
(6x-1) + (X+14) + 20 = 180 
6x - 1 + X + 14 = 160 
7x - 1 + 14 = 160 
7x + 13 = 160 
7x = 147 
X = 21. 
Now solve for the angles by plugging in X.
A = 6x - 1 = 6(21) - 1 = 125 degrees
C = X + 14 = (21) + 14 = 35 degrees. 
I believe these are the solutions.
        
             
        
        
        
Answer:
130 degrees 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: train A arrives first
Step-by-step explanation: 
 
        
             
        
        
        
Answer:
A:
Misaki had 2 identical pencils that weighed a total of 19 grams, where x is the number of pencils and y is the total weight of the pencils.
Step-by-step explanation:
One of the points is 2 and 19, 2 is along the x axis and 19 is along the y axis