Mari and jen each work 20 hours a week at different jobs. mari earns twice as much as jen. together they earn $480. how much does each girl earn in a week?

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

Ineed to know how to write question one in mathematical terms

Find the area of the region between a regular hexagon with sides of 6" and its inscribed circle.