Which equations are correct?

select each correct answer.

−3y4(5y2+2)=−15y8−6y4

−7x2(4x3+2)=−28x6−14x2

−5d3(3d2+4)=−15d5−20d3

−2b3(6b2+5)=−12b5−10b3

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