U4L2 HOMEWORK: Function Tables answer plz help

Charles is on a 8 1/2 mile bike ride. he stops for a rest after he’s gone 5 2/5 miles. how much farther does he still have to go?

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

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2