Answer:
x+√y
Step-by-step explanation:
Answer:
x = 13
Step-by-step explanation:
2/3 and 12/18 are equivalent fractions, and 12+18 = 30 so the answer is 12:18
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

.