What is the surface area?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

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

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle