Answer:
x = 20  
Step-by-step explanation:
x - 8 = 12                          Add 8 to both sides
x -8 + 8 = 12 + 8               Add -8 and 8; add 12 and 8
x = 20                       
 
        
                    
             
        
        
        
Answer:
   see below
Step-by-step explanation:
For simplifying expressions of this sort, there are four rules of exponents that come into play;
   
__
I find it convenient to eliminate the fractions by adding the exponents, then rewrite any negative exponents as denominator factors.

 
        
             
        
        
        
Increasing it by 10% will be 11.55. To find teen percent all you do is make it a decimal then multiplying it by 10.50
        
             
        
        
        
30 divided by 60 is 1/2 
1/2 miles per minute
10 x 1/2 = 5
5 miles in 10 minutes
Hope this helped