For this case, we have that by definition, the circumference of a circle is given by:

Where:
d: Is the diameter of the circle given by 2r, that is, twice the radius.
If we have a circle with a diameter equal to 8cm, then the circumference is given by:

ANswer:
Option C

 
        
                    
             
        
        
        
Answer:
6.4x
7. 3y
8. y−4.5
9. 7/2 x+2
10. 4y+2
11. 7x
12.  2.2w−0.5
13. (1 2/3) (b) + 6 2/3
14. 15/4x + 3/2
15. 0.8x+2.5
Step-by-step explanation:
I GOTCHU FAM
 
        
                    
             
        
        
        
Hope this answer helps you! Please make it the brainiest answer if it does! :)