Answer:
2 units
Step-by-step explanation:
the radius is always half the diameter
d = 2r
 
        
             
        
        
        
THE STEPS AND ANSWER IS IN THE PICTURE
 
        
        
        
Here, 2x + 1 = 3x
3x - 2x = 1
x = 1
In short, Solution would be 1 only. 
Hope this helps!
        
             
        
        
        
Answer:
3 gallons at 3 dollars a piece
Step-by-step explanation:
2.25 •6=13.50
4.50•3=13.50
13.50+13.50= 27.00
36-27=9
9÷3=3