exam Maths Puzzle Numerical Ability

find the center and radius of the circle given by x(squared)- 4x + y(squared) -6y + 12 = 0

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exam Other Question

The relative density of an object may be defined as its weight in air Wa, divided by the difference of its weight in air and its weight when submerged in water, Ww. For a lead weight, Wa = 1.097 Ww. Find the relative density of lead. (3y^8)^4 / (2zy^2)

I started out with

(3y^32) / (2zy^2)
not sure where to go from here