After figuring out a common difference in this pattern, we can get further terms in the pattern:
1, -2, 2, -4, 0, -3, -1
We can't see any given circle. The general form for a circle centered at the origin with radius r is

Answer:
well you didn't show problem 11 but here is a pretty photo of Port orford Oregon
-3 =-2x - 7
Add 7 to both sides
4=-2x
Divide by -2
-2 = x