Answer:
119
Step-by-step explanation:





 
        
             
        
        
        
3 = -(-y + 6)
First, simplify brackets. / Your problem should look like: 3 = y - 6
Second, add 6 to both sides. / Your problem should look like: 3 + 6 = y
Third, simplify 3 + 6 to 9. / Your problem should look like: 9 = y
Fourth, switch sides. / Your problem should look like: y = 9
The answer is D) 9.
        
             
        
        
        
Answer:
63°
Step-by-step explanation:
The sum of all interior angles of a triangle = 180°
Therefore:
x + 96° + 21° = 180°
x + 117 = 180
Subtract 117 from each side 
x = 180 - 117
x = 63°
 
        
             
        
        
        
Answer:
Non-linear equations:


Step-by-step explanation:
Linear equation: y = mx + b
Therefore, a linear equation has 2 variables that have no exponents.
So the non-linear equations are:
 (this is a quadratic equation - polynomial with degree 2)
  (this is a quadratic equation - polynomial with degree 2)
 (this is an exponential equation)
 (this is an exponential equation)