B) 12.75
Just add them all together
10+15+14+8+18+11+12+12+10+10+17+16=153
The devide the anser by the ammount of numbers you added together
153÷12=12.75
Answer: an endless cylinder with radius 4 mm and centerline
Well just multiply 891 with 1.6
To get 1425.6mph
