If r = 2 units and X = 6 units, then what is the surface area

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

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?