Answer:
30
Step-by-step explanation:
180-100=80
80+70=150
180-150=30
 
        
                    
             
        
        
        
120°
the sum of the interior angles of a polygon = 180°( n - 2)
where n is the number of sides
here n = 6 ⇒ sum = 180° × 4 = 720°
thus each interior angle =  = 120°
 = 120°
 
        
                    
             
        
        
        
Answer:
$2.60
Step-by-step explanation:
 
        
                    
             
        
        
        
5x+3y=12
Subtract 5x from both sides 
3y=-5x+12
Divide by 3
Y=-5/3x +4