Triangle OPR has length OR=5m, angle OPR = 90, find length QP

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

What are the exclude value of mn+3m

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