Ik it’s either a or d but i am not sure, i hope this helps
        
                    
             
        
        
        
Answer:
-5z+1
Step-by-step explanation:
-11z-4+6z+5
-11z+6z-4+5
-5z+1
 
        
             
        
        
        
Answer:
d I think is right sorry If it's not
 
        
             
        
        
        
Answer:
D) 240 000 cm³
Step-by-step explanation:
V = 100cm×80cm×(80-50)cm
= 8000cm²×30cm
=  240 000 cm³