Can some help me and tell me what region it is

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319