Please need help:) what is the length of XZ

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

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score

Find the measure of angle c in the following triangle.