This is your answer.... all you are doing is substituting what ever the variable is
 
        
        
        
Answer:
13:8:7
Step-by-step explanation:
84 - 24 = 60
60 oranges were either ripe or unripe.
18 more ripe oranges than unripe oranges.
x + 18 = ripe oranges
x = unripe oranges
x + 18 + x = 60
2x + 18 = 60
2x = 42
x = 21
21 are unripe oranges
21 + 18 = 39
39 oranges are ripe.
Ratio of the number of ripe oranges to the number of rotten oranges to the number of unripe oranges.
39:24:21
13:8:7
 
        
             
        
        
        
Answer:
(-x+3)+(x+5)= -x+3+x+5. =now add the numbers -x+8+x = now combined like terms = 8 now 8 is the answer 
 
        
             
        
        
        
4ax+12-3ax=25+3a
Ax+12=25+3a
Ax=25-12+3a
Ax=13+3a
X=13/a+3
        
             
        
        
        
Hi there!
So first to find the diameter, you will need to find the radius of the circle because the diameter is twice the length of the radius. 
Find the radius from the circumference, which is 

.
C= 

212= 

212/

=r
Then solve for r.
Radius= 33.74
Then multiply the radius by 2 to find the diameter.
Diameter= 2 * 33.74
Diameter= 67.5 inchesHope this helps :)