0.4 divided by 0.515 and then round the answer by the nearest 10th

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

List the sides of δrst in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m