*fill in the blanks with the correct letters* (you don't have to explain it i just need the answers )

the general form of the equation of a circle is
7x^2 + 7y^2 - 28x + 42y - 35 = 0.

the equation of this circle in standard form is

a. (x - 2)^2 + (y + 3)^2 = 5
b. (x - 2)^2 + (y + 3)^2 = 18
c. (x - 4)^2 + (y + 6)^2 = 24
d. (x + 4)^2 + (y - 6)^2 = 24
e. (x + 2)^2 + (y - 3)^2 = 35

the center of the circle is at the point __

a. (-14,21)
b. (-2,3)
c. (2,-3)
d. (-4,6)
e. (4,-6)

and it's radius is units.

a. 5 1/2
b. 3(2 1/2)
c. 2(6 1/2)
d. 35 1/2