Answer:
Step-by-step explanation:
{0, -8, -16, -24,...} here you add -8 each time so the rule is 

the 71 term is 

 
        
             
        
        
        
4/5 because look at the picture
 
        
        
        
Answer:
-4x-6x=-20= 
x=2
-3(2x-3)=33=
x=-4
4x+3x+2x=180
x=20
Step-by-step explanation:
-4x-6x=-20                                
-4+(-6)=-10x
-10x=20 (divide both by 10) 
x=-2 (divide by -1 to get positive) 
x=2
-3(2x-3)=33
-6x+9=33
      -9 .  -9
-6x=24 (divide both by -6)
x=-4 (divide by -1 to make positive) 
4x+3x+2x=180
(combine like terms) 
9x=180 (divide both sides by 9)
x=20