Answer:
20.65%
Step-by-step explanation:

 
        
             
        
        
        
Volume is Length x width x height. So what are three numbers that multiply to 90?
30x30x30=90
        
                    
             
        
        
        
Answer:
(2,0); x = 2; y= 0
Step-by-step explanation:
add the system and u get y = 0. substitute in the first equation and u get x = 2
 
        
             
        
        
        
Answer:
76 sqcm.
Step-by-step explanation:
2(5 x 2) + 2(5 x 4) + 2(4 x 2) = 2(10) + 2(20) + 2(8)
                                              =  20 + 40 + 16
                                              =  76