<span>1/3(21-3a)=6-a
I simplified the equation to the form, which is simple to understand 
<span>1/3(21-3a)=6-a
Simplifying:
<span> + 0.333333333333*(21-3a)=6-a
Reorder the terms in parentheses
<span>+(+7-1a)=6-a
Remove unnecessary parentheses
<span>+7-1a=+6-a
We move all terms containing a to the left and all other terms to the right. 
<span>-1a+1a=+6-7
We simplify left and right side of the equation. 
<span>a=-1
<span>0=-1
The left and right sides are not equal, therefore there is no solution. This equation is invalid
Hope this helped
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<u>Answer:</u>
The expression that can be used to determine how fast an elephant runs in miles per hour is 100 miles per hour
<u>Solution:</u>
Given that,
Distance covered by an elephant in 36 seconds is equal to 1 mile
Therefore, <em>distance covered by the elephant in 1 second</em> is   mile
 mile
Therefore, <em>distance covered by the elephant in 60 seconds</em> (60 seconds = 1 minute) is 

Therefore, <em>distance covered by the elephant in 60 minute</em> (60 minute = 1 hour) is

Hence the expression that can be used to determine how fast an elephant runs in miles per hour is 100 miles per hour
 
        
             
        
        
        
Itself should go in the blank
        
             
        
        
        
Yes 9.1 is the same as 9.10. .10 is greater than .08
        
             
        
        
        
Answer:
25x3 + 25x2 - 19x + 7
  —————————————————————
         5x + 2        
Step-by-step explanation: