The standard form of the equation of a circle is:

Where the point (a,b) represents the centre and r is the radius. So, given your information, the equation will be:
Answer:
the answer is 10 to the 5th power
Step-by-step explanation:
0.4 because if it’s five or more, add one more. If it’s four or less, let it rest.
Answer:
Its b
Step-by-step explanation:
got it right on edg