Jill has a gift certificate for a movie rental. each time she rents a movie, $6 is deducted from her gift certificate balance. if m represents the number of movies jill rents, which of these expressions can be used to determine her gift certificate balance?
a.30m – 6
b.30m + 6
c.30 + 6m
d.30 – 6m

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