Domain is all the possible inputs of an equation. In this example, the only concern is the x + 5 because the denominator cannot equal 0 because we can't divided by 0. So we set x + 5 equal to zero and solve for x.
x + 5 = 0
x = -5
The restriction is that x cannot equal -5.
        
             
        
        
        
Answer:      20 diagonales
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
d= +3
Step-by-step explanation:
1st term = -19
2nd term = -16 
d = 2nd - 1st 
d= -16-(-19)
d = +3
 
        
             
        
        
        
Answer:
54
Step-by-step explanation:
30,42,54,66,78
counting by 12