Equations -
I like to find the decimal expression of the fractions, to make this easier.

Divide each sides by 0.6

Answer: 6/7
 
        
                    
             
        
        
        
The labeled point in which it will be rotated around
        
             
        
        
        
Answer:
x = 10 is your answer
- Explain - 
Step 1: subtract 1 from both sides (subtraction of equality)
which will give us:
2x = 21 - 1
which equals to
2x = 20
Step 2: Divide both sides by 2
which is 
2x/2 = 20/2
2/2 = 1 and 20/2 = 10
Therefore the answer is x = 10
 
        
             
        
        
        
Answer:
Yes
Step-by-step explanation:
Because they are the same equations, just flipped. hope this helped
 
        
             
        
        
        
19
Step-by-step explanation:
when we add 9 and 10 we will get sum 19