Answer:
93°
Step-by-step explanation:
By exterior angle theorem:
(4x + 9)° = 2x° + (3x - 12)°
(4x + 9)° = (2x + 3x - 12)°
(4x + 9)° = (5x - 12)°
4x + 9 = 5x - 12
4x - 5x = - 12 - 9
-x = - 21
x = 21
Measure of exterior angle 
= (4x + 9)° 
= (4*21 + 9)°
= (84 + 9)°
= 93°
 
        
             
        
        
        
X⁵+ x +2x³ + 6+ 2x²     =        x⁵ + 2x³ +2x² + x + 6
        
                    
             
        
        
        
Complete 2/3 x the number of plates
        
             
        
        
        
Yes because 9+4 = 13 and if you plug in the y and x it turns out true
        
             
        
        
        
-1 is your x intercept so the first point is going to be at (0,-1) and from there go up 1 and over to the right 2 and mark another point and so one