Iknow that is easy but to hard for me i am 9 th

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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

What is the circumference of the pie