Answer:

Step-by-step explanation:
Given the equation of the circle: 
We wish to express it in a Standard form:
We begin by re-arranging:

Next, divide the coefficient of x by 2, square it and add it to both sides.
Do the same for y.

Next, we factorize

This is the standard form.
The answer is 40% I believe because if you add 18+12 you get 30 and 12/30 when converted is 40%
Answer choice A. The function moves left 4 units, and 2 units up.