Can anyone help with solving system of equations graphs i am confused but the grahping part

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

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