PLZ answer 21 points and brainlest
pls answer both questions

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

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

Find the value of x. give reasons to justify your solutions! l, m ∈ kn