Answer: Mass is how much stuff something is made of. Volume is how much space an object takes up.
 
        
             
        
        
        
Answer:
okay let's start
Step-by-step explanation:

 
        
             
        
        
        
The correct answer:
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Explanation:
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Assuming you mean:
" √(9a²)  +  (√49b)  −  a  +  √b " ;
Simplify the expression:
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Note that:  " √(9a²) = 3a " ;
                   "√(49b) = 7√b " ;   
And we write the expression
   →  " 3a  +  7√b  −  a  + √b " ; 
Combine the "like terms:
   " + 3a − a  =  2a " ;
   " +  7√b  +  1√b   =  8√b " ; 
Rewrite:  
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    " 2a  +  8√b " ;  which is:  Answer choice:  [C]:  " 2a  +  8√b " .
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Answer:
The answer is 
1.    27.659 
2.   27.658
3.   27.657
4.   27.558
Step-by-step explanation:
Decreasing order is greatest number to the least.
I really hope this helps