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Which of the greatest common gcf of 32 and 48 a 16 b 96 c 8 d 32

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?