Answer:

Step-by-step explanation:



Answer:
I believe its 15
Step-by-step explanation:
Step-by-step explanation:

Answer:
30
Step-by-step explanation:
HOPE THIS HELPS
PLZZ MARK BRAINLIEST
Answer:

And solving we got:

If we subtract 100 from both sides we got:



Step-by-step explanation:
For this case we have the following equation given:

We want to find a general expression given by:

Where the center is (h.k) and the radius is r.
We can begin completing the squares of the equation given and we got:

And solving we got:

If we subtract 100 from both sides we got:

Then we can conclude that the center is:

And the radius would be:
