Ok ok Ik I ask too many questions but does anyone know 008fortnitebeast?

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

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

The square root of 9x plus 7 plus the square rot of 2x equall to 7