Please help me with this :)

Rewrite so the subject can be y in the formula d=m-y/y+n

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]