How can i turn 5x+5×7 into a fraction

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

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

Factor the expression using gcf 9b+45