exam Maths Puzzle Numerical Ability

find the center and the radius of the circle x^2+2x+y^2-6y-6=0

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exam Other Question

For x>0, what is 7x divided into 2 then divide by 1 divided into 4x

a. 3.5x
b. 14x
c. 28x
d. 14x^2
e. 28x ^2 (2x+5)/(x^2+8x+15)-(x+2)/(x^2+8x+15)