I need help please ?

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

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work

Which of these statements is correct? the system of linear equations 6x - 5y = 8 and 12x - 10y = 16 has no solution. the system of linear equations 7x + 2y = 6 and 14x + 4y = 16 has an infinite number of solutions. the system of linear equations 8x - 3y = 10 and 16x - 6y = 22 has no solution. the system of linear equations 9x + 6y = 14 and 18x + 12y = 26 has an infinite number of solutions.