21 because a triangle is always going to equal 180 so add those then subtract and it’s 21
        
             
        
        
        
Answer:
X = -7
Step-by-step explanation:
 
        
                    
             
        
        
        
Step-by-step explanation:
Find the slope of JK by the formula :y2-y1/(x2-x1) whose value is 4/5
similarly, calculate the slope of GH it's value is also 4/5
Find slope of GK now by same formula y2-y1/( x2-x1 ).the value will be -5/3
Similarly calculate slope of HJ and you will get its value to be -5/3 
since parallel lines have equal slopes JK and GH are parallel and GK and HJ are parallel. Since opposite sides are parallel GHJk is parallelogram 
 
        
             
        
        
        
The standard form of a line: Ax + By = C where A, B and C are integers.
Answer:
2x + 3y = -6
-4x + 3y = 12
x - y = 5
 
        
             
        
        
        
Answer: D) 49.86
276.99 x .18 (or 18%) = 49.8582