Answer:
1. 2.6
2. 29.1
3. 2490
4 3.4
Step-by-step explanation:
The equation of a circle with center
and radius
is

In your case,

Plug these values into the generic formula and you'll get your equation.
Answer:
9 or 11
Step-by-step explanation:
These are the answers because:
1) The number before 10 and after 10 is 9 and 11
Therefore, the answer is 9 or 11
Hope this helps!