Un estudiante debe resolver 45 problemas si un día resolvió 2/5 (dos quintos). ¿Cuántos problemas resolvió?
¿cuántos problemas le falta por resolver?
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Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?

Ineed i been stuck on this question since yesterday

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