30 centimeters cubed is the answer
        
             
        
        
        
Answer:
minimum value of z is 0
Step-by-step explanation:
if x and y both equal zero, then the value of z is zero, which is your answer.
 
        
             
        
        
        
Answer:
c
Step-by-step explanation:
 
        
             
        
        
        
Answer:
hello your question is incomplete attached below is the complete question
answer : 
H0 : <em> u </em>= 21.62    ( Null hypothesis ) 
H1 : <em> u</em> = 21.62   ( alternative hypothesis )
Step-by-step explanation:
Formulating hypothesis that can be used to determine whether the population mean rate at 5 CCF of residential water discharged by U.S public utilities differs from $21.62 
H0 : <em> u </em>= 21.62    ( Null hypothesis ) 
H1 : <em> u</em> = 21.62   ( alternative hypothesis )