Answer: an endless cylinder with radius 4 mm and centerline 
 
        
             
        
        
        
3r+n2−r+5−2n+2<span />=3r+n2+−r+5+−2n+2=3r+n2+−r+5+−2n+2<span />=(n2)+(−2n)+(3r+−r)+(5+2)<span />=n2+−2n+2r+7<span /><span />
=n2−2n+2r+7
        
                    
             
        
        
        
The circumference of the circle is = 2 x pi x 6 = 37.7cm
To find the arc = 360 divided by 169 = 2.13
The arc = 37.7 divided by 2.13 =  17.69 cm
        
             
        
        
        
You would use the counting principal. 12X3X3
        
             
        
        
        
Answer:
possibly z2-6 so try the third one
Step-by-step explanation: