Basically answer both of these, thank you very much! (find the formulas and then the 8th term)

been trying to get this answered for a while now

Which equation represents a circle with a center at (–3, –5) and a radius of 6 units? (x – 3)2 + (y – 5)2 = 6 (x – 3)2 + (y – 5)2 = 36 (x + 3)2 + (y + 5)2 = 6 (x + 3)2 + (y + 5)2 = 36

Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.