On a recent business trip, it took 7 hours 30 minutes to drive 375 miles. How many miles per hour was the average?

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

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Ineed no it anyone can see this