Answer:
9) A
10) B
11) A
12) D
13) C
14) A
15) C
16) D
17) E (not sure, can't see full choice)
18) B
19) C
Explanation:
Hope this is what you're looking for friend :)
For any circle with Cartesian equation

,
we have that the centre of the circle is

, and the radius of the circle is

.
So in the case that

,
we essentially have that

.
So the centre of the circle is

, and the radius is

.
12 - b = -2
12 + 2 = b
14 = b
Answer:
A. 2.25
Step-by-step explanation:
-3x + 10 = 5x - 8 (Given)
10 = 8x - 8 (Added 3x on both sides)
18 = 8x (Added 8 on both sides)
2.25 = x (Divided 8 on both sides)