45 was divided by a power of ten to get 4.5. what power of ten was it divided by?

With alll of except for the 2 that i did already

The tile along the edge of a triangular community pool needs to be replaced? ?

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