Can someone help me understand this question and tell me how to do it

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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

Do more republicans (group a) than democrats (group b) favor a bill to make it easier for someone to own a firearm? two hundred republicans and two hundred democrats were asked if they favored a bill that made it easier for someone to own a firearm. how would we write the alternative hypothesis?