Answer:
12in is you answer
Step-by-step explanation:
The formula to find circumference is 
so to rearrange to solve for radius that will be 
=
=11.94in
This is a sum that needs understanding the starting and the ending number first. then you should understand that between the starting and the ending number there has to be pairs of numbers with a difference of 0.75.
The numbers are:
10.75, 11.50, 12.25, 13.00, 13.75, 14.50.