In the diagram, transversal t cuts parallel lines a and b. which equation is necessarily true?
a.
m∠1 = m∠7
b.
m∠3 = m∠6
c.
m∠5 + m∠8 = 90°
d.
m∠6 + m∠7 = 180°

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