What is the answer for 4/15÷5/5

Factor the monomial completely 42a3b3

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

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.