Answer:
-3, uh its a short answer
they could only be changed under certain circumstances
Answer

Step-by-step explanation:
Radius is always half of the diameter so,
is equal to
.
The Formula for Circumference is 
Since we found out the radius, we need to basically substitute (or insert) it into the radius spot so the next step will be:
Then we multiply (2)(1.25) to get an answer of 2.5 (which we already know)
So our answer is going to be 
Hope this helped and answers your question! Have a great rest of your day/night!
Answer:
(7,-3)
Step-by-step explanation: