Which expression correctly determines PR in triangle PQR?

Is this a polynomial function? i need to know asap

Landon wrote that 3−2.6=4. which statement about his answer is true?

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